Debug radio connection issues - Verizon Samsung Galaxy S 4

I'm running stang5litre Ediition 5.0 OC1. Works fine, touchwiz home crashes on boot sometimes.
It got a wee bit of blunt force trauma, specifically something dented the back right above the sim card symbol(in the plastic, not the actual sim card), the battery a little, and cracked the screen.
It then refused to connect to wifi or cell towers, so I rebooted a few times, and it started to work.
Now it takes a long time to get an IP address from wifi, and seems to have a lot of disconnection issues. Youtube videos for example will load really slowly, and then run out of buffer, "There was a problem while playing Tap to retry". But not in a consistent manor, do it five times in the first 10 seconds of a video, but then got to 2:30 fine. (And then wifi completely disconnected)
Also wifi disconnects a few times a day(that I notice), and it seems to lose cell tower connection at the same time.
Now, that's some odd symptoms, but easily chalked up to apophenia.
So how could I go about getting real information about how the radios are performing?
Didn't look like any of the USSD codes were relevant except a debug menu one, but it didn't work.
Many thanks for any tips on how to look into this. (Especially terminology stuff, if I know what things are supposed to be called I can search better)

Related

[Q] Phone reliability Poll SGSII

Just doing a reliability poll to see how everyone else is getting on with their phone so far. if you vote other please specify the problem so it can be added to the poll.
No way to delete emails from am IMAP emailaccount with stock samsung software. Emails always just reappear after next sync.
Random reboots
I voted 'Other'.
I get very occasional reboots. I've only had 3 or 4. Thinking about it, they seem to happen mainly after installing apps. It's not really a problem as the phone seems to works flawlessly after the reboot.
I also voted other. Wifi seems unreliable, often dropping out when selecting links in web pages. To gte it to work requires the wifi to be turned off and back on again. It's not browser specific as I've had it happen with both the stock browser and Dolphin HD. My router is set to G and the signal is strong enough according to Wifi analyser. I've tried changing channels but it seems to have made no difference.
Other than that the phone has exceeded my expectations.
My Sms and 3g crashed out the other night, but the phone gave no indication of it happening. This is unnerving as I'm a system administrator and rely upon sms to know when our servers are down.
Sent from my GT-I9100 using XDA Premium App
I've had a few lockups and phone reboots.
I also had the phone get very hot due to SyncmIDS taking 96% CPU and running the battery down quickly...
Finally the audio keeps disappearing - no sounds of any sort and the only way to get it working again is to reboot...
This is the latest ROM (as of today) running TouchWiz and no attempts at root.
I also have occasional wifi problems where it sticks at getting an IP, so you have a wifi symbol but it doesn't connect, stays using 3G.
Apart from when it got hot, the battery life is no worse than the Galaxy S... but the hot battery run down has happened a few times now.
So it's not bad for beta software shame it's claimed to be release software
USB OTG is a nice feature.
Much faster than my Galaxy S though and brilliant screen.
More issues...
Must have crashed and shutdown (black screen - had to press and hold the power button).
It just decided to reboot while it was sitting on the desk (screen off), as I heard the boot music.
My phone occasionally turns off on its own. Very annoying. I'm thinking of getting a replacement in case it's a bad apple.
Mine's fine - great in fact. I've only had it a week though

RAZR XT910 problems

I have been using the phone for 2 days now and I observed the following problems:
1. The WiFi signal is weak. I mean in the areas where my HTC Desire or iPhone 4 has one signal bar, the RAZR XT910 has no signal
2. The device does not wake-up sometimes. I have to press the power button several times. I guess this is lag from the android OS.
3. I have got some lags and errors from the android OS these two days. Hope some updates will come.
Please reply if you have similar issues with your device, especially the first two points.
Any 3G/UMTS problems?
I cant connect to 3G only EDGE.
I cant see 3G networks.
Sent from my XT910 using XDA App
I have no problems with 3G.
dragosel80 said:
I have been using the phone for 2 days now and I observed the following problems:
1. The WiFi signal is weak. I mean in the areas where my HTC Desire or iPhone 4 has one signal bar, the RAZR XT910 has no signal
Click to expand...
Click to collapse
Agreed. I have an Australian Razr and have found the same issue. Haven't noticed an issue with speed but the signal strength indicator is definitely on average a bar down on my Galaxy.
2. The device does not wake-up sometimes. I have to press the power button several times. I guess this is lag from the android OS.
Click to expand...
Click to collapse
Agreed too. Just happened then but instead of eventually waking it restarted. Has also happened once before but did eventually wake.
3. I have got some lags and errors from the android OS these two days. Hope some updates will come.
Click to expand...
Click to collapse
Nothing here on this one.
Despite the above still loving the phone.
2. The device does not wake-up sometimes. I have to press the power button several times. I guess this is lag from the android OS.
Click to expand...
Click to collapse
This might be caused by in pocket detection. Disable it, might help.
Semseddin said:
This might be caused by in pocket detection. Disable it, might help.
Click to expand...
Click to collapse
Great point. Will disable now and see how it goes. Cheers
Seems razor australia ns seem to be having problems what are your guys build dates located in settings? Mines 19 october and camera seems to be fuzzy..
Sent from my XT910 using XDA App
I have an optus razr
I have none of the issues you are experiencing. The 'low' wifi signal strength is probably caused because you are connected to a wireless-g router. The razr is capable of wireless-n . I always get full signal bars connected to my 'n' router and 2-3 bars on my 'g' router.
No issues using the power button to turn the phone on/off. No lag in the interface. Miss my optical trackpad from my desire though
My router is wireless-n. I have just checked with the router and it have the weakest from all my mobiles.
Anyone else with this problem?
Try to set your router to support a/b/g + n WiFi. Sometimes WiFi chips can behave very strange.
the router is set to support a/b/g + n WiFi. I have htc desire with g Wi-Fi. the problem comes from the razr wifi.
okay so, I'm back on XDA Developers after owning an iPhone 3, 3Gs and 4 for a couple years (after I moved on from my old Nexus One) and I've had the RAZR for a couple days..
an issue I ran into on the first day of owning it, was constant rebooting when the phone was put to sleep.. I couldn't figure out what the issue was apart from that it only occurred when I was connected to wifi at home (didn't happen when I was connected to wifi anywhere else or when wifi was switched off)... so I went back to the store I got it from for a replacement.. hoping that the phone wasn't going to encouter the same rebooting issues, to my bad luck, it kept happening.. so I thought that maybe it wasn't just because I got myself a dud (both times)...
so today I did some diagnosing the issue which I localised to being my router settings... and luckily enough, it WAS the configuration of my router... I tried to see what the differences were between my configurations at home, and that of the wifi routers at work...
So apparently, the RAZR doesn't like the following (could be just one of them, or a combination of both):
- SSID Not Broadcasting (i.e. Hidden SSID's)
- MAC Address Filtering.
So I unhid my SSID and now it's broadcasting, and I also turned off MAC Address Filtering and using WPA security instead.. Now the phone doesn't constantly reboot. Just odd that the phone doesn't like those settings. Anyways, just happy the phone doesn't constantly reboot when put to sleep.
Hopefully these details help anyone else who ends up running into the rebooting issues when put to sleep.
Have a same problems with my RAZR. But all my wi-fi network is hidden and wpa2 personal secured, but phone randomly rebooting only at work.
home router - time capsule (apple)
work router - d-link DIR320.
P.S. if i disable wifi on phone- no rebooting at all.
Raze phone issues
I have a Razr sourced from Mobicity in Australia, bought from them to avoid the Optus bloat. I love this phone it is a gorgeous piece of kit, big beautiful screen, fast etc. BUT twice in the last two days I have received phone calls, answered them, and the caller was unable to hear me. And ultimately I need this to be a reliable phone first and a gorgeous bit of kit second.
Anybody else suffering similar problems. I hav had to revert back to my iphone4 because I have to have a reliable phone for work. I'd love to find the issue and am open to any suggestions. I am on Telstra by the way.
Ok. Problems I have encountered the 2 days I have used the phone:
Constant freeze. The first hour I used the phone it froze and rebooted 7 or 8 times.
Missing SocialLocation.apk. This caused a problem for the GPS in smart actions to work at all. Rooted phone and installed the app, and problem disappeared.
Tried to hard reset the phone because of all the rebooting problems. Guess what, on the first menu coming up where you can choose language, the phone froze and rebooted again. Now still it is constantly freezing and rebooting.
The freezing issues does not really have one specific app causing it. It can happen whenever doing whatever!
Anyone got a solution for this? Maybe a OTA update for Norwegian model?
For anyone mentioning the loss of WiFi signal, i think its suffering from what the iPhone 4 did, its dependant on where you hold the phone, i think the WiFi receiver on the phone is right about where youd hold the phone (in the middle at the back of the phone)
I noticed i was getting the dropping of signal bars, so decided to test it out, holding the phone normally the bars would drop 1 maybe 2 (in my living room where my desire gets full bars) then held it around the edges of the phone and instantly got full bars again.
I cant say this IS the problem you lot are having, but i definitely find holding the phone a little differently from what i normally do makes a huge difference for me.
Anyway just my 2 pence, hope this helps some of you guys.
nafpez said:
For anyone mentioning the loss of WiFi signal, i think its suffering from what the iPhone 4 did, its dependant on where you hold the phone, i think the WiFi receiver on the phone is right about where youd hold the phone (in the middle at the back of the phone)
I noticed i was getting the dropping of signal bars, so decided to test it out, holding the phone normally the bars would drop 1 maybe 2 (in my living room where my desire gets full bars) then held it around the edges of the phone and instantly got full bars again.
I cant say this IS the problem you lot are having, but i definitely find holding the phone a little differently from what i normally do makes a huge difference for me.
Anyway just my 2 pence, hope this helps some of you guys.
Click to expand...
Click to collapse
I have problem 1 and 2 and weak wi-fi even when the phone is on my desk (not touching it with my hands that is)
1、yes, the wifi is weak
2、when the phone is being charging, sometimes I press the power button it wakes but go dark quickly, and I have to press the button again
I'm on my second Razr right now. My first had the blotches on the screen when using a black background. My second Razr has an unresponsive touchscreen a few times a day. I used to assume that my phone was locking up, but it went to sleep when I pressed the power button, and woke up with a working touchscreen. It will also respond to volume and screen rotation, just no touchscreen until you sleep/wake it.
medicramirez said:
1、yes, the wifi is weak
2、when the phone is being charging, sometimes I press the power button it wakes but go dark quickly, and I have to press the button again
Click to expand...
Click to collapse
Maybe you have pocket detection enabled, and when you put your hands in front of the sensor the phone screen shuts off, you don't even need to put your hands in front of the screen, sometimes all you need is to make a shadow in front of the sensors and you will see the phone screen shut off.
Happened to me sometimes, but i knew right away it was pocket detection shutting off the screen.
Thank God i have no complains at all about my phone, maybe a the wifi weakness problem, but for me it still have a very good speed at home on wifi, so don't care about the bars at all.

[Q] Anyone else having a problem with WIFI disconnecting every few hours?

The only problem I have with the new EVO is it will disconnect from WIFI every few hours forcing me to turn WIFI on and then off again. Anyone else have this problem or is it just me?
Sent from my EVO using xda premium
So far, mine has been rock solid on two routers. Hopefully you didn't get a bum unit.
Sent from my EVO LTE using XDA
i personally haven't had this problem, but you are not alone:
http://forum.xda-developers.com/showthread.php?t=1671744
everyone is complaining about disconnect/reconnect there.
Yes.
Sometimes it's fine sometimes it's not.
I left in the car came back and it didn't reconnect to WIFI on it's own.
Even if I did a WIFI scan it would not reconnect.
Toggled WIFI and it reconnected fine.
FYI, I am rooted.
I have that problem...have had to reconnect 3 times today. No way to tell if you're disconnected either (besides not being able to hit websites, email, play store, etc).
I've had this happen to me a few times. Even with 3g actually. Anyone else experiencing 3g disconnects/reconnects?
Sent from my E4GLTE on XDA.
so, finally this is happening to me this morning, after 2 days of rock solid wifi. this morning I noticed when I turn screen on, wifi was off but connected itself real quick as I was unlocking it. I know it was disconnected because then I got 2 emails and gtalk messages that SHOULD HAVE come trough and notified me half hour prior.
I've been messing with the wifi sleep and power settings ever since, sending myself chat requests to test. it seems 20 minutes is the cutoff time before wifi drops to one bar or disconnects. this is a problem as chat messages should be pushed instantly, not when it gets around to reconnecting itself.
I've tried all different "yes no"options under keep wifi awake, power, etc etc and it seems 20 minutes either disconnects wifi or goes into some low-power wifi that is too weak to get push notifications. it seems to me it checks once every half hour for notifications if "never keep wifi from sleeping" is checked. again, this is a HUGE problem for things like chat programs, fring, anything that uses internet to communicate and not the 3g network.
again,I wasn't having thus problem for the last 2 days till I woke up this morning. This phone isn't getting secret background updates is it?? it still would need to tell me it downloaded and ask if I want to install, right??
me thinks this has to do with network scanning, for lte, as there is no connect or stay connected options for lte,I assume its gonna auto connect and disconnect to save battery like the thunderbolt did. I think its auto low-powering the wireless chip too except 3g in the same manner, unless never disconnect wifi during sleep is checked, and then it just turns it on and off. well,I have one of those weak internal-antenna routers so when it goes low-power, it can't stay connected of or moves or someone walks between me and the router. its a big problem to get chat notifications and Skype calls half hour later than they were sent because my phone is in done kind of auto-power-saving mode. I've spent the last 4 hours messing with this issue.
someone help!!
This morning my WiFi was connected without having to turn WiFi off/on again. I checked the other thread mentioned and my 'Keep Wi-Fi on during sleep' option is already set to 'Always'. I haven't rooted my phone yet so everything is stock.
For me it will show WiFi at the top as if it is connected but I try to do anything online and it won't work till I turn it off/on again. At that point I will receive any old notifications too.
I know for sure it's not my router because my Galaxy Tab continues to work just fine. I also have 3 computers connected to the WiFi with no issues.
Going to try a few more things and fiddle with the 'Best Wi-Fi Performance' option as well even though my signal shows full.
HTC!!!!! its always two steps forward, one step back!! something happened to my phone overnight because now connectivity is just jacked after the phone goes into sleep mode. no new apps installed
its true! the one X forums have way more relevant info than the evo forums have. they have a fix for this, but you have to be rooted. i also found this, which works for our evo:
http://blog.onthegosolutions.com/index.php/2012/05/01/hidden-power-saver-menu-htc-one-x/
How to access the hidden power save menu
Mine seems to not be staying connected when I let the phone sleep for a while. No problems while I am using it or signal dumping just when it's sleeping. I have my settings set to never. Annoying, hopefully fixed with a software update.
After setting the best wifi performance option on it seems that my notifications and wifi work better. Not sure how much this drains the battery though since I am at my desk with it charging most the time.
Sent from my EVO using xda premium
Papichulo06 said:
I've had this happen to me a few times. Even with 3g actually. Anyone else experiencing 3g disconnects/reconnects?
Sent from my E4GLTE on XDA.
Click to expand...
Click to collapse
This started happening to me yesterday, as well as the phone rebooting when it attempts to connect to Veriz -- err, roaming data. I've also had the issue where I had to toggle WiFi to get it to connect to an AP again; these issues used to happen to my OG EVO way back when, so this has to be some sloppy software change management on HTC's part. My EVO's going back to Sprint; I don't pay to beta test.
I already posted in the other thread, but will say this.
Please call sprint and voice your issue. If/when they have enough complaints, someone at htc will look into it and it will hopefully be part of the next update.
Btw, I think one of the triggers is no wifi activity. If you're getting push email every 45-60 min, then wifi remains on. If not, then it shuts off after about an hour.
The hidden power settings applies only to when the battery is low (25 or 15% remaining). Either way, it doesn't fix the problem.
Notch another one with this issue.
I had the issue even when I turned on my phone for the first time. I connected to the wifi during setup and couldn't activate my dropbox because of lack of connection.
Once I got through setup, I turned off wifi, turned it on and it worked again.
But there has been a few other times, especially when I first enter a wifi spot, I need to turn off and turn on.
It is quite annoying. And like somebody else said, there is no way of knowing this until you try something.
this seriously is a huge problem. google voice calls don't come through, emails don't come, anything internet connection. once you on off it,I had 8 missed calls, ten work emails, etc etc. plus if it thinks its connected, shows the wifi bar, but not actually connected, it fubars your 3g data connection for a few minutes trying to connect to something. I am furious about this as I didn't have this problem my first two days with this beautiful phone. now I'm seeing the ugly side, and I don't like it. and I'm not rooted yet so I can't fix it!!!!
the google voice phone calls do NOT come through, and this is a major major problem. wtf was htc thinking??
I wonder if a suitable work around might be to use some wifi keep alive widget running that pings the router every 30-60 minutes...?
I'm not sure, someone more knowledgeable will have to let us know. I imagine it won't without being a huge battery drain. shouldn't auto sync do that anyway? I'll look and try later tonight if don't hear from any experts
I'm not sure what autosync is? I use k9 mail setup with imap/push.

RSAP intermittent since upgrade to Android v5.0

Hi All,
Firstly, I'm new here so please accept my apologies in advance if this is entirely the wrong place to open up this thread. Forgive me if I've gone into too much detail here, but thought it made sense to put as much info down - much of the following mayor may not therefore be relevant to the particular problem I'm having.
I have a Galaxy Note 3, which I've had for some 19 months now and it has generally been very good and reliable. I drive quite a lot, and my car is a VAG group car which uses rSAP to connect via Bluetooth - this too has been very stable and reliable.
About 3 months ago I noticed that my battery life had suddenly reduced dramatically, despite no change in use from my part (no new apps, not suddenly watching YouTube 24/7 etc.). I figured the battery had passed it's best, so went to the high street and purchased a new genuine Samsung battery, but this behaved exactly the same as the original battery.
I then noticed, occasionally, that while at home, my WiFi was dropping it's connection to my router, complaining that "Authentication Failed" (despite the WiFi password not having changed). Disabling the WiFi on the phone, and then re-enabling it seemed to fix this.
The following month, I had a notification from my provider that I'd used 80% of my data allowance, and a few days later another warning that I was at 90%. I get 10GB per month in my deal, and AFAIK, I've never in the past come anywhere close to using this up. A few days later, I tried to get online to google something, and landed on an EE page telling me I'd used up all my data for the month, which would reset the following day. I put this down to the WiFi Authentication problem mentioned above.
The following day, the phone told me that an android update was available. I applied this update, and thats when things started going really odd! The phone suddenly became very slow to respond. Sometimes turning the phone on would yield the lock screen with no wallpaper, other times I'd get the wallpaper and nothing else (no digits to unlock the phone for example). And I noticed that when in the car, the rSAP connection would drop off after 10 minutes or so - I put this down to the phone being unresponsive, and called EE.
EE recommended that I return the phone to factory defaults, which I did. After this, the phone is definitely more responsive, but now my rSAP connection drops out after around 2 minutes, and then re-connects. If I am actually on a call, the connection stays up for a little bit longer, but still drops out after 5-7 minutes. If I have the phone plugged into a charger in the car, it stays connected for a little bit longer, sometimes up to 15 minutes, but still regularly drops it's connection.
I noticed that this new o/s has a new feature for "Trusted devices", which I've added the car as, but this made no difference.
It is almost as if, this new version has included some sort of bluetooth power saving feature whereby if nothing much is happening (i.e. I'm not actively in a call), the conneciton drops out after a couple of minutes - unless I'm on external power, in which case it drops out after a bit longer. Prior to the update, it would stay connected, sometimes for hours at a time.
Has anyone else encountered this problem, and can you offer any suggestions as to what I might be able to do to investigate further (eg. are there any bluetooth logs I can inspect?) or better, fix the problem.
Your help is much appreciated

Wifi and Bluetooth randomly dropping out

So I've noticed that randomly throughout the day my phone will randomly disconnect from Wifi and Bluetooth. It always drops both at the same time then reconnects.
Has anyone else had this problem?
For me the Mobile Connection Drops every few seconds.....No Network...4G TLE with 5 Bars.......No Network...4G TLE with 5 Bars.....No Network...4G TLE with 5 Bars.....No Network...4G TLE with 5 Bars...
Got my My LG G5 from T-Mobile... After 3 days the phone has been overheating, and every 10 seconds it drops Mobile Connection...I went through a plethora of tests with T-Mobile Support and they determined that I need a replacement device...so waiting for the replacement...One other thing, I notice this happened after calling T-Mobile to Unlock the device...So not sure if there is any correlation between my issue and T-Mobiles Unlock App, T-Mobile said the two were not related.
WiFi is unstable for me, too. Disconnects randomly every hour or so. I mostly notice it when casting to my Chromecast. I have to reconnect to the app in order to regain control. I've tried multiple routers, and the problem is reproducible with both. Bluetooth hiccups, too, but never fully disconnects. I haven't noticed that the WiFi and Bluetooth disconnects coincide. Mine is AT&T branded.
I've got a similar issue, only the wifi is fine most of the time, but Bluetooth skips every few minutes and has completely dropped twice. I'm exchanging my device tomorrow to see if that fixes it. I also got a crap battery as well. Kinda disappointed with this $700 purchase.
xbenjii said:
So I've noticed that randomly throughout the day my phone will randomly disconnect from Wifi and Bluetooth. It always drops both at the same time then reconnects.
Has anyone else had this problem?
Click to expand...
Click to collapse
Me too, i disappointed
Okay so, I've only managed to reproduce it on 5GHz networks. It doesn't seem to drop out on the 2.4GHz band. Bluetooth doesn't drop out either.
Scrap that, just happened again at work on a 2.4GHz connection. Hopefully it's just a software bug that will be fixed in a later patch.
I have 5Ghz wi-fi at home and it's been rock solid. Have also had no issues with bluetooth. Hope you get it figured out.
Both bands Wi-Fi & BT rock solid for me too. The BT in particular seems much stronger than my 6P which had occasional drop outs even at close range.
Sent from my LG-H850 using Tapatalk
I notice that it reports "Avoiding poor connection" in the WiFi menu when it's disconnected. I'm sitting in the room with the router, so maybe the "poor connection" detection is too aggressive.
Mine just starting dropping WiFi while the screen is off, I check the settings and everything is setup right it just started to happen today. I would F/R the phone and see if that helps
I exchanged mine for a new one, and the WiFi connection remains inconsistent.
xbenjii said:
So I've noticed that randomly throughout the day my phone will randomly disconnect from Wifi and Bluetooth. It always drops both at the same time then reconnects.
Has anyone else had this problem?
Click to expand...
Click to collapse
Mine also does this and seems to be getting worse also vibrations have also stopped all together
I can't even get through 1-2 songs on bluetooth before it disconnects and plays through my phone speakers... it has zero issues connecting in the first place and sounds fine, but then just drops.
I do have pretty unreliable wifi at home so I'm playing some music with wifi switched off to see if it could somehow be related to wifi dropping, but these songs I'm playing are cached to my phone from Play Music so that'd seem weird to me..
Also wondering if hardware and distance has an issue with it. I had it 2-3 yards away from my bluetooth shower speaker when it disconnected. I'm playing it right next to it now and so far into song 2 with no issues. I've never had this issue with my G4, which is a bummer, because that phone was a piece of junk that my G5, otherwise, outclasses in every possible way.
To update, the Bluetooth issues absolutely seem to be linked to wifi drops, at least from my testing. Even playing local media, I noticed both dropped at the same time, but I played through 5 songs with my wifi toggled off and not a single problem.
Those of you with issues in the car, is your wifi toggled off completely? I'm wondering if it's affected by having wifi on, or just by a random wifi drop.
I've had wifi issues with every Android phone I've owned since IPv6 became normal in home routers. I blame Google for refusing to use DHCPv6, the most widely used dynamic network addressing protocol, instead using some weirdass protocol called RDNSS which NOBODY uses. I've found the best fix is to ensure your router is set to stateless autoconfiguration for IPv6, but it doesn't fix it completely. Those who have a router that can shut v6 off, try it out. Xfinity doesn't let you.
I will say my g4 behaved the exact same way on wifi, but I don't remember Bluetooth having issues. I don't use it much, though, since I have an AUX in my car and Chromecast music.
Having the same issue as well. Fought with sprint for weeks and went through a few replacements in that time... Got the G5 as a free upgrade and it's doing the same thing. Done with LG devices...
Yes, and I just made a thread about it. Oops. Anyone try resetting phone? I'm about to but that's a pain having to bring it all back and make sure I back everything up.
WIFI Problem
Kinolay said:
I exchanged mine for a new one, and the WiFi connection remains inconsistent.
Click to expand...
Click to collapse
Has anyone managed to solve it?
Kinolay said:
I exchanged mine for a new one, and the WiFi connection remains inconsistent.
Click to expand...
Click to collapse
That is not promising as I've had this issue since day one hoping an update would solve it to no avail trying to avoid getting a replacement.
My last phone did the exact same thing. For 2 years. Also constantly closing apps I was using, freezing, and my keyboard would disappear frequently. It did it from Day 1. It was a nightmare.
Finally got a new phone (and moved up to Marshmallow,) and the drops have started happening after less than 1 week. They really need to find out what's causing this!

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