Unacceptable 4G Stability? - Thunderbolt Q&A, Help & Troubleshooting

Using a Verizon / HTC Thunderbolt, final retail model.
Not even tethering, just holding the phone in my hand, I'm getting 4 bars of signal and a signal strength of -77 dBm.
Seems to work fine most of the time, with good downstream, well within acceptable limits of the "5 to 12 Mbps" advertised, though it's extremely variable (it tends to regularly oscillate between these speeds, occasionally dropping down to EvDO speeds).
But the speeds aren't important, just an indication of the good signal strength.
Maybe it's just my cell tower, but I am very frequently seeing no network activity at all; can't even get to google or check for software updates. It's about as unreliable as Verizon's crap DSL. This is the polar opposite of the rock-solid stability I used to get with EvDO in the exact same place (in my house). Is it the 4G network being unreliable, or the Thunderbolt? Anyone else have this problem?
Edit: In terms of the patterns of the total downtime, it seems to go down for periods of 5 to 10 minutes per hour. Sometimes the downtime only lasts 15 or 30 seconds, other times I am completely out for 10 minutes, even though it says "4G LTE" in the dock and I am still getting good signal strength. My data usage for the month is under 5GB but above 2GB. I tend not to make very bursty traffic; except for app downloads, most of my traffic is of the low throughput, consistent variety (loading webpages, listening to MP3 streams at 128Kbps, etc). I use it very often but the bandwidth usage at any given time is probably lower than the speed of an EvDO connection (unless you count webpages that are downloaded at faster-than-EvDO speeds for a split-second to load them). I'll be using it and then it's just *down*. I can still make phone calls during the outage.

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I noticed the same thing. I was all over the place cycling through no data, 1x, 3G, and 4G in like a minute in the same spot. I rebooted and got a much more stable 4G connection.

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I'm thinking your expectations are a little too much. There are many areas I don't get a good 3g, let alone a 4g signal. I live in a suburb of Chicago and am in 4g 95% of the time, I don't always pay attention, because, after all, it's a phone first, but 4g seems to be there whenever I need it.
Also, in regards to unacceptable, what are you comparing it to? Is there more acceptable 4g signals in your area?

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fillyo said:
I'm thinking your expectations are a little too much. There are many areas I don't get a good 3g, let alone a 4g signal. I live in a suburb of Chicago and am in 4g 95% of the time, I don't always pay attention, because, after all, it's a phone first, but 4g seems to be there whenever I need it.
Also, in regards to unacceptable, what are you comparing it to? Is there more acceptable 4g signals in your area?
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I'm comparing it to Verizon EvDO / 3G. While speeds on EvDO were only about 20-25% of the max speed of LTE / 4G, it was completely reliable -- at least in my area.
Keeping the phone almost completely stationary sitting at my desk, connected to the same cell tower, and with my roaming data programmed to the latest version, my EvDO phone (a Droid 2) would have the connection available whenever I asked for it.
With the same exact usage pattern but with LTE, my Thunderbolt often has no connection, and it spontaneously comes back by simply waiting around for it to become available.
I expect the 4G channel to be "open" 24/7/365, not ever completely down -- especially while stationary in a standard building with a very high signal strength (always 4 bars). I have no unusual EMF like microwaves or bluetooth going on, just a laptop and a desktop and 2 LCDs. Wooden house, and I'm on the top floor.
If they can make EvDO stable 24/7, and EvDO is based on the same CDMA technology as LTE, why can't they make LTE stable 24/7 also? And I also don't understand why my phone does not fall back to EvDO if and when the LTE drops out. I recall a few times over the years of using it that my EvDO would fall back to 1x/RTT in the event of an EvDO downtime. But the MTBF of EvDO downtimes in my area was around 1 year. Now, the MTBF of LTE is about 50 to 120 minutes.

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brandnewsimmy said:
I noticed the same thing. I was all over the place cycling through no data, 1x, 3G, and 4G in like a minute in the same spot. I rebooted and got a much more stable 4G connection.
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I rebooted my phone and am getting a more stable 4G connection now, too I wonder if the phone itself has a stability problem with its 4G transceiver after a certain period of uptime? I will test this theory over the next couple days by rebooting my phone whenever I have a problem, and see if it helps.
Edit: I usually keep my phone "up" 24/7, and just leave it on the charger when I'm not on the go. I power it off only rarely, because I want to receive phone calls and text messages. When I just rebooted it, it had 2.5 days of uptime (hard to have too much uptime considering launch day was just a few days ago!)

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fillyo said:
I live in a suburb of Chicago and am in 4g 95% of the time...
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Out of curiosity, what suburb are you in that you're getting 4G 95% of the time? I live in Highland Park (about 20 miles up the north shore) and I don't have nearly as good of coverage (still decent though and I'm not complaining).
Sent from my ADR6400L using XDA App

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I'm guessing it has to be your area. I am getting amazing 4G coverage in LA. I going to assume its going to take VZW some time before their 4G coverage truly blankets areas. I remember when 3G came out.. it was totally spotty for a long time until they had enough towers.

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Kind of like what I recorded on my phone this afternoon....?
http://www.youtube.com/watch?v=qRTOCFoGFmU
5 min clip showing me cycling through web and map but getting no data, despite cycling airplane mode on and off. This has happened almost daily since getting the phone last Thursday, in multiple locations that are supposedly full 4G areas. Pretty annoying.
Double annoying since I got the Verizon phone because they're network's so much better (allegedly)...and yet my Nexus S on T-Mobile had full bars and fast "4G" data in the same location. I'd also had a reboot, and the 1tx symbols flashing but wasn't recording at the time. I'd been screwing around with this for at least 10 minutes before activating ShootMe to record it.

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Thrillhouse847 said:
Out of curiosity, what suburb are you in that you're getting 4G 95% of the time? I live in Highland Park (about 20 miles up the north shore) and I don't have nearly as good of coverage (still decent though and I'm not complaining).
Sent from my ADR6400L using XDA App
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Well im in Gurnee area with 4g 99% of the time. Only time without is in my GF's brothers house. no 3g there either though lol. otherwise i never loose 4g. Even driving to vernon hills and around i always have 4g. not sure y in HP u dont always have it.

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i am complete opposite i have 2-1 bars inside a building getting 12mbps

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I notice it has an issue where it just randomly drops all my signals to search for 4g even though its not in my area... I think the only way to get reliable signal would be to set the radio to whatever you are using mostly... *#*#4636#*#* will get you into diagnostics and select phone infotmation and then choose CDMA auto for 3g or lte mode..... I'm thinking in the near future there will be a update that allows for easier lte turn off like 4g on the evo... the automatic thing is nice but it wastes battery and seems to cause some problem

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RafficaX said:
Well im in Gurnee area with 4g 99% of the time. Only time without is in my GF's brothers house. no 3g there either though lol. otherwise i never loose 4g. Even driving to vernon hills and around i always have 4g. not sure y in HP u dont always have it.
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Hm. Not sure either, Gurnee/Vernon Hills is pretty close, maybe I just need more testing time (I'm also indoors most of the time).
Sent from my ADR6400L using XDA App

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Thrillhouse847 said:
Hm. Not sure either, Gurnee/Vernon Hills is pretty close, maybe I just need more testing time (I'm also indoors most of the time).
Sent from my ADR6400L using XDA App
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i mean i never saw 4 bars on 4g but 2-3 always and hit 30 on the down and 50 on the up while in the antioch walmart lol but never with out 4g expect in that one house lol.

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I just set mine to LTE only let's see if its more stable than the auto mode

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itzjonjon69 said:
I just set mine to LTE only let's see if its more stable than the auto mode
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let me know, i should try that too. never thought of that when looking at it. wonder if ill save a bit of battery not trying to also find 3g, im sure i lose very lil hunting for 3g but still. saving some battery may give me another in on 4g lol

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RafficaX said:
i mean i never saw 4 bars on 4g but 2-3 always and hit 30 on the down and 50 on the up while in the antioch walmart lol but never with out 4g expect in that one house lol.
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You realize that the phone is incapable of 50 up, don't you? Those kinds of speeds are a known bug in the Speedtest.net and other similar speed tests that don't deal with the Thunderbolt's large transmit buffer properly.

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Anyone else seeing any errors in the logcat that look similar to this?
D/DATA ( 1779):[QCTMM] DataNetStatistics sent == 0 && received == 0 newActivity=NONE
D/DATA ( 1779): sentSinceLastRecv=0,watchdogTrigger=10,maxindex=0
E/TrafficStats( 1555): [QCTMM]tryAll index =1
E/TrafficStats( 1555): [QCTMM]tryAll index =2
There is an entry like this every few seconds when I'm on mobile data.

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RafficaX said:
Well im in Gurnee area with 4g 99% of the time. Only time without is in my GF's brothers house. no 3g there either though lol. otherwise i never loose 4g. Even driving to vernon hills and around i always have 4g. not sure y in HP u dont always have it.
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verizon towers fallowing u now? from 95% now 99% lol ...that 1% its your gfs house damn it.... probably a bridge on the way and tower to tall to go under ...****...otherwise u would it have 100% wooohoooo

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I'm at my desk at work in times square, nyc. Yesterday I had 1-2 bars of 4g at my desk. Today, my phone has yet to switch out of 1x mode my entire 2 hour commute here and so far today. I tried rebooting and can't get 3g or 4g to come on. I'm pretty annoyed