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When waking up device, gets black screen, hangs for few secs, then reboots

When attempting to wake up device (SPH-L720) from sleep using power or home button, it doesn't wake up, gets blank screen, the menu and back soft buttons LED lights come on, hangs for few secs on the black screen, then reboots by itself. Issue happens randomly and sometimes once a day or multiple times an hour. It seems like the problem existed before rooting and installing custom ROM but I've just noticed it.
I'm using TriForce 3.0 ROM (Android 4.2.2) w/ baseband L720VPUAMDL and kernel 3.4.0-KT-SGS4-ga23d84c. I've tried wiping/reinstall ROM, reflashing back stock ROM, removing microSD card. Nothing helped. The battery charges properly and is usually fully charged. No wear and tear or damage of any kind. Device is 1 month old.
Any ideas what might be causing the problem and suggestions for possible fix?

its because of the kernal, mine does this aswell..

kyledb said:
its because of the kernal, mine does this aswell..
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Did you find a fix? Does changing the kernel fix the problem? If so, which kernel did you go with? It's driving me crazy lol. Thanks!

I cannot speak to whether or not, as somebody else suggested, the kernal is at fault, but I too am using KT Kernal and have this issue.

beerindex said:
I cannot speak to whether or not, as somebody else suggested, the kernal is at fault, but I too am using KT Kernal and have this issue.
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Did you notice if you had the issue before rooting and flashing the KT kernel? I'm trying to narrow down the cause. I'm thinking of trying another kernel to test and see if it fixes the problem.

verto8 said:
Did you notice if you had the issue before rooting and flashing the KT kernel? I'm trying to narrow down the cause. I'm thinking of trying another kernel to test and see if it fixes the problem.
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I don't recall it happening before root, but I rooted fairly soon after getting it. I cannot remember whether it happened while it was stock rooted. As to the kernel, I flashed it immediately after installing my rom, so I would not be able to distinguish between the two as a source.

I switched to the agat kernel and it stopped rebooting until I attempted to watch videos... So I went back to ktoonz..it is most defiantly a kernel issue as this is a known issue with that kernel I deal with it everyday and its absolutely annoying

There is a nice selection to pick from.. Agates..kt...stock....chronic..and faux ..had the same issues on KT but fixed it by UV down 15 across the board ..also for some reason 8/20 worked better for me ..but my fix might not work for anyone else..I really liked chronic..running faux now ..I hated reboots ..my phone was rebooting before I ever rooted it ..who knows my carrier wanted me to bring it in for a replacement ..decided it was time to start reading

beerindex said:
I don't recall it happening before root, but I rooted fairly soon after getting it. I cannot remember whether it happened while it was stock rooted. As to the kernel, I flashed it immediately after installing my rom, so I would not be able to distinguish between the two as a source.
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Same situation here. I rooted and flash a custom ROM on mine right after I got it. I believe it had the issue pre-root on stock ROM/kernel, but I'm not a 100% sure. I had same issue w/ the Cyanogenmod ROM, not sure what kernel it was using.
kyledb said:
I switched to the agat kernel and it stopped rebooting until I attempted to watch videos... So I went back to ktoonz..it is most defiantly a kernel issue as this is a known issue with that kernel I deal with it everyday and its absolutely annoying
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Click to collapse
Do you remember if you had the issue on stock ROM before rooting? I believe mine has always existed and might be a hardware problem because I tried different ROMs/kernels and issue persisted with all of them.
ParkerParker said:
There is a nice selection to pick from.. Agates..kt...stock....chronic..and faux ..had the same issues on KT but fixed it by UV down 15 across the board ..also for some reason 8/20 worked better for me ..but my fix might not work for anyone else..I really liked chronic..running faux now ..I hated reboots ..my phone was rebooting before I ever rooted it ..who knows my carrier wanted me to bring it in for a replacement ..decided it was time to start reading
Click to expand...
Click to collapse
Is there a comparison thread of different kernels? I'm wondering what the pros/cons of each and maybe some user experience feedback. I believe mine was rebooting as well when it was on stock before rooting. This seems like it might be a hardware problem rather than software (ROM/kernel). Do you think everyone w/ a Sprint Galaxy S4 (SPH-L720) is having this issue? If so, Samsung should do something about it because it's super annoying!

Update: I've been using latest version of KT-SGS4 kernel 3.4.59 (Aug 25 build) for over a day and it's been pretty stable w/ no occurrence of the problem. I'll keep this thread posted w/ updates if I run into any problem. Thanks to everyone for their help!
2nd Update: it still has the problem.

It's still happening but at a slightly lower frequency with the latest KT-SGS4 kernel. For those who have tried a different kernel, did it fix the problem? I'm trying to narrow down the source and convince myself for certain that it's a software rather than a hardware issue.

Same issues
I have been a lurker here for a while, and have found most of the answers that I am looking for without having to ask any questions. For that I say thank you.
I would like to let you know that I am experiencing the same issue with my rooted SGS4. I do not recall having the issue before rooting the phone (I ran it stock for a month or so before rooting it in early July). Today I did a factory reset and re-installed Tri-Force 3.0. Here is some more info if it helps.
SPH-L720
Android 4.2.2
L720VPUAMDL
Hardware Ver. L720.08
Kernel 3.4.0-KT-SGS4-ga23d84c
I am going to try to un-root it this afternoon and go back to out of the box stock to verify it is not a hardware issue.
I am mostly posting here to follow the thread hoping for a fix.

grnerd said:
I have been a lurker here for a while, and have found most of the answers that I am looking for without having to ask any questions. For that I say thank you.
I would like to let you know that I am experiencing the same issue with my rooted SGS4. I do not recall having the issue before rooting the phone (I ran it stock for a month or so before rooting it in early July). Today I did a factory reset and re-installed Tri-Force 3.0. Here is some more info if it helps.
SPH-L720
Android 4.2.2
L720VPUAMDL
Hardware Ver. L720.08
Kernel 3.4.0-KT-SGS4-ga23d84c
I am going to try to un-root it this afternoon and go back to out of the box stock to verify it is not a hardware issue.
I am mostly posting here to follow the thread hoping for a fix.
Click to expand...
Click to collapse
Try that and odin back to stock mf9 not mdl. Tri-force is mf9 based so maybe thats why you get those issues because you need firmware kernel modem and such. Also it could be that kt kernel had been reported to cause some of those issues.

i went to a new rom and new kernal and this is still happening to me, i have no idea what it is now.... any solutions from anyone?
UPDATE: BAD MICRO SD CARD!!!!!!!!!!! REMOVED MY SD CARD AND NO ISSUES IN THE PAST 2 DAYS
NEW UPDATE: SPOKE TO SOON..

Deesleep issue on stock firmware

Hey guys, i have question regarding the deepsleep issue that a lot of people have with the s6 edge + after root. I have searched the issue but i can't find any definitive answers (maybe that's just me?). All point to modded kernels.
I rooted my phone on 5.1.1 and immediately ran into the issue where the phone refuses to go into deepsleep. I only got half a day of battery life since then. I flashed back stock firmware with odin several times, but the the issue persisted. Since then only modified kernels have been my savior. Now on 6.0.1 i'm still having the same issue. I was hoping it was a firmware bug on 5.1.1. Obviously not. I read somewhere that it was tied to KNOX, but still no definitve answer. So my question is. Will i ever be able to get the phone back to stock and working like before root? If it is possible, how would i go about this? I will sell this phone in the near future, so i would like to sell it unmodified.
Thanks in advance guys.

Unfortunately, the only time I ran into this issue is when i updated to 6.0.1. I later rooted and installed a custom ROM and kernel, and surely enough, problem was gone. I plan on staying like this since obviously, there's a lot more benefits when it comes to custom ROMs. Logically reverting back to stock should in theory should i theory fix your deep sleep issue, if this is not the case then.....sorry.

Speedster_1 said:
Unfortunately, the only time I ran into this issue is when i updated to 6.0.1. I later rooted and installed a custom ROM and kernel, and surely enough, problem was gone. I plan on staying like this since obviously, there's a lot more benefits when it comes to custom ROMs. Logically reverting back to stock should in theory should i theory fix your deep sleep issue, if this is not the case then.....sorry.
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Going back to stock will not cure this because you have rooted the phone.I used the TWRP recovery method of rooting and only loose around 5% overnight.

Did the PE1 update fix the High Android System usage? Is it safe to update with root?

I rooted my phone with the correct methods as in the threads below mine, and I purposely havent updated my phone for a while, just in case the root would only work for older system versions.
I'm just curious to know if, now that I'm rooted, is it safe to update to PE1, and will it fix the Android System battery drain? I've also downloaded all the root fixes too, as well as the Debloat, so my original System Updates app doesn't work anymore.
I would love to get just some answers from the pros on this before possibly bricking or boot looping my amazing phone.
Thanks!

*bump* Hate to bump, but does anyone know this question? After flashing all the fixes, I notice my battery still kinda goes down somewhat fast when in use and sometimes a bit fast when the screen is off.

Squall429 said:
*bump* Hate to bump, but does anyone know this question? After flashing all the fixes, I notice my battery still kinda goes down somewhat fast when in use and sometimes a bit fast when the screen is off.
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I don't know if PE1 fixes the drain but it can be rooted and downgraded if needed. Same thing for the newest PF2 firmware I have here.

I have the same problem idk what to do if PE1 fixes the battery drain I'll gladly update if not I might have to go back to stock and just stay on it unless someone can find a way to unlock bootloader so we can get custom roms (only reason I wanted root tbh)

So I can just take the update now, WHILE rooted and I'll be fine? Will I have to re-root after the update is done, or do I just continue using it as normal?
Will I have to re-flash the new fixes for the PE1 version and stuff? Since I have flashed the old NON-PE1 fixes, will this brick my phone when updating to PE1?

noob question

Been a nexus user for a while till I sold it last year to get the s7 but I recently came back to the 6p, and my question is, will rooting it cause that bootloop of death some people been getting? I'm not under warranty since I bought it off a friend so I wanna b very cautious when proceeding to rooting and changing roms. Any help is appreciated

shooterlgk said:
Been a nexus user for a while till I sold it last year to get the s7 but I recently came back to the 6p, and my question is, will rooting it cause that bootloop of death some people been getting? I'm not under warranty since I bought it off a friend so I wanna b very cautious when proceeding to rooting and changing roms. Any help is appreciated
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Click to collapse
Many people are getting the BOD on stock with the bootloader locked. Rooting has nothing to do with the BOD

shooterlgk said:
Been a nexus user for a while till I sold it last year to get the s7 but I recently came back to the 6p, and my question is, will rooting it cause that bootloop of death some people been getting? I'm not under warranty since I bought it off a friend so I wanna b very cautious when proceeding to rooting and changing roms. Any help is appreciated
Click to expand...
Click to collapse
Well, I have switched ROMs about 4-5 times this week itself. Started off by going to 6.0.1 from 7.1.1 without any issues. Also flashed EX and franco kernels a couple of times. As for root, it has never been a problem. If flashing SuperSU causes bootloop, then the simple fix is to reflash the ROM or restore a Nandroid backup.
Don't get skeptic when you have a Nexus :good: If there is going to be a major issue at all, then it can only be an hardware failure. :highfive:

DJBhardwaj said:
Well, I have switched ROMs about 4-5 times this week itself. Started off by going to 6.0.1 from 7.1.1 without any issues. Also flashed EX and franco kernels a couple of times. As for root, it has never been a problem. If flashing SuperSU causes bootloop, then the simple fix is to reflash the ROM or restore a Nandroid backup.
Don't get skeptic when you have a Nexus :good: If there is going to be a major issue at all, then it can only be an hardware failure. :highfive:
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Click to collapse
Ok thanks I feel more comfortable rooting now. For the January update is it the same procedure?

shooterlgk said:
Ok thanks I feel more comfortable rooting now. For the January update is it the same procedure?
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Yes. Just have TWRP installed and flash SuperSU v2.79. Link: https://s3-us-west-2.amazonaws.com/supersu/download/zip/SuperSU-v2.79-201612051815.zip

Rooting?

Does anyone know of a rooting guide specifically for the 930A? I'm not a n00b, but I'm hesitant to use methods from other variants, especially if it requires having to mine from potentially hundreds of pages.
And at this point, I'm not even sure which version of the firmware is still rootable.

still works...
General_Mayhem said:
Does anyone know of a rooting guide specifically for the 930A? I'm not a n00b, but I'm hesitant to use methods from other variants, especially if it requires having to mine from potentially hundreds of pages.
And at this point, I'm not even sure which version of the firmware is still rootable.
Click to expand...
Click to collapse
As of today 2/03/2018, the latest OTA installed phone is still able to be rooted using same old EngBoot boot but requires downgrade first. Also thought I might mention that I have not noticed any battery drain issues or lag issues that have commonly plagued the engboot method. Perhaps the OTA changed something that may have been related to whatever made the engboot cause the issues related to battery drain and lag. I don't know but phone is rooted and working better then ever using engboot.

is there a guide to get this working?

alienG0D said:
As of today 2/03/2018, the latest OTA installed phone is still able to be rooted using same old EngBoot boot but requires downgrade first. Also thought I might mention that I have not noticed any battery drain issues or lag issues that have commonly plagued the engboot method. Perhaps the OTA changed something that may have been related to whatever made the engboot cause the issues related to battery drain and lag. I don't know but phone is rooted and working better then ever using engboot.
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Click to collapse
Which of the many threads did you use/follow to root? If you can point me in the right direction, I *may* attempt it and if I can get it to work, I *may* write up a step-by-step like I did for my TMo S5.
Thanks.