Too many instability on my device - Galaxy S III Q&A, Help & Troubleshooting

Hi, I'm having a very unstable S3. Unluckily I'm an advanced and enthusiast Android user, unluckily because I've to suffer the continuous proposals of an untouched device, as solution for all my problems, you should understand me! [emoji16]
So... I won't renounce uselessly to any app or tweak, if you are not expert surely you can't help me.
-----
My device:
Device: Samsung Galaxy S3 International 16 GB (+64 GB exFat SD);
Rom: CyanogenMod 11 M9 (upgraded from M8);
Modem: LG8;
Kernel: BOEFFLA Kernel (the last stable release, sometimes the last beta);
Mods: BRAVIA Engine 3 and xLoud (both flashed before kernel), Xposed Framework (some modules included GravityBox, with "few" tweaks enabled), customed build.prop e init.d script files.
The "heavier" build.prop tweaks:<br />
power_supply.wakeup=enable
persist.sys.ui.hw=1
debug.sf.hw=1
dalvik.vm.checkjni=true
dalvik.vm.verify-bytecode=true
dalvik.vm.execution-mode=int:jit
dalvik.vm.dexopt-flags=m=y
Useless report init.d tweaks, there are stupid things respect to build.prop ones.
-----
Premised my device specifications, I'm having a "war" against System UI who freeze the entire system for a long time before goes to FC. After many full wipes, the same problem.
In the first middle of July I decided to reconfigure my phone at "workmanlike", knowing what to do, how and when.
According to a terrible ARHD experience in last summer, "two" reboots instead one, then the wizard, then Xposed Framework, kernel and mods, while at last I did all the rest.
Initially I was moved by the greatful performance, but after a week, regressions started with the already cited System UI crashes, that make the everyday life an hell. Now the problem is extended to other apps.
Main apps sometimes require a long time to be opened, showing a black screen until a FC.
Enabling the view of all the ANR dialogs, I noted that Facebook at casual times is not responding and at bootup it slow system for many seconds. I always hated Facebook Android development, performance and battery saving are critical for everyone.
Since some days also cLock have lots of FCs, and upgrading from M8 to M9 I did a mistake: I reflashed Gapps, causing another "collection" of FCs of Google services such Play Services and Play Framework, because I replaced part of updates with old versions... so I think and I hope I'm wrong, less problems is better!
I need your help to know causes of my terrible instability, I know also a fast, powerful but rare S3 in my hands, I want know what let it to be so useless and enervating.
I did lots of resolutive attempts, e.g. wipe cache and Dalvik cache, do data restore and wipe with Titanium Backup, but nothing. [emoji26]

---

Go back to a stock rom after a full wipe. If still the same then your nand has bad blocks.

---

boomboomer said:
Go back to a stock rom after a full wipe. If still the same then your nand has bad blocks.
Click to expand...
Click to collapse
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
According to eMMC BrickBug Check no bad blocks were found, nor affected by Sudden Death.
Why should I turn to the stock firmware?

---

boomboomer said:
Go back to a stock rom after a full wipe. If still the same then your nand has bad blocks.
Click to expand...
Click to collapse
+1
Return to a good stock firmware and don't install any mods to see if it is stable for maybe a day or two. Then one by one install the mods that you use. (Too many mods could cause stability issues due to some conflicts I'm sure you know). And it could even be one of them that is causing issues/or cyanogenmod has stability problems
Sent from a "Galaxy" far, far away with my Ultra Ray Gun

---

Pulseuser said:
+1
Return to a good stock firmware and don't install any mods to see if it is stable for maybe a day or two. Then one by one install the mods that you use. (Too many mods could cause stability issues due to some conflicts I'm sure you know). And it could even be one of them that is causing issues/or cyanogenmod has stability problems
Sent from a "Galaxy" far, far away with my Ultra Ray Gun
Click to expand...
Click to collapse
Try the stock firmware is useless:
CyanogenMod 11 since some months is considered stable, I've no enough time to make lots of attempts as you require to me.
CyanogenMod 10.2 stable... terrible: fast reboots cause bootloops, camera is unstable and there are some FCs in certain conditions.
I've asked your help for exhaustive answers, you should know what can be conflictual better than me, i.e. some build.prop line.
Undo phone to the original state (rooted or unrooted) is only a waste of time.
I know that there isn't any hardware or logical issue on my device, I know that CyanogenMod 11 is an almost stable rom... so where I "concretely" wrong? If you need more info about my device hardware/configuration... simply ask [emoji106]

---

Shrugs and walks away...

---

boomboomer said:
Shrugs and walks away...
Click to expand...
Click to collapse
I've not understood your answer.