Phone random shut down - Galaxy S6 Q&A, Help & Troubleshooting

Guys how may of you have had your s6 power off for reason and have had to perform a soft reset?how often as it happened?cheers for reading

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[Q] Dream immediately reboots on Power down.

Dream immediately reboots on Power down.
Hey All,
Forgive me if this has been addressed before but I can't seem to find it anywhere aside from a similar issue where the phone running CM reboots or restarts spontaneously (this is not my issue - not quite).
For me, I simply can't get the phone to Power Down and stay down - instead, after choosing "power down" from CM6 and even from Recovery (using RA-dream-v1.7.0R-cyan.img) the phone "powers down" and momentarily appears to be off but boot up once again. Needless to say, a really annoying issue for me and not at all helpful on the battery saving front.
Sorry for ignorance on what this might be but any insight would be helpful.
Cheers!

Random reboots to Optimizing App screen

My phone is on 5.1.1 custom Rom. I am having issues with random reboots. I did fresh install after flashing factory image. Phone reboots randomly and stuck on boot logo. After several attempt to restart phone, it goes into Android optimizing app screen and starts optimizing few apps. it boots normally after completion. how do i solve this issue.
I am really pissed with this issue. I havent installed any other kernel but phone continues to reboot to "Optimizing apps 1 of 166" screen.
Please help.
It looks like phone get bricked. I tried to wipe data, system, cache to install Rom but phone gets restart. I am able to reboot to bootloader but phone gets restart again. How do i install factory rom with this issue.
Problem of power button
This is not a software problem as this optimization of apps is due to the failure or shot of power button have you ever noticed this happens only when. You use power button ..
These are solutions for you
If your phone is under warranty carry it to the service center.
If not it is so expensive that the authorized service request you to change whole mother board.
Better find any local service center to replace power button..
Or use apps like gravity screen which helps you to use the phone without the need of power button but concern is it consume more battery..
Or
Rapidly press your phone power button until the phone is completely on till home screen is visible this is only a temporary solution
As I am junior member I can't share any link of the video about nexus 5 power button failure
Just search in YouTube for nexus 5 power button then you can a video of 2min 6sec just do as same may help you

Nexus 5 Random Shutdown Frequent Problem

I don't understand how exactly can I explain the situation, but I'll be as specific as I can. Please try to understand and help me from this.
My Nexus 5 is on Marshmallow without any roots etc ever. Now, the problem goes like this:
Suppose I press power button once, then screen should turn on/off once. Now this which happens normally in any phone happens in mine for first few times, then it starts like if I press power button once to turn screen off, it goes from off and turns back on, I again press power button, again from on it goes off and back on, this keeps on happening until I try my luck for it to off, but then sometimes it happens like after so much pressing it eventually show me "power off" option on screen(which generally should open if I hold the power button). Now once I encounter this "power off", no matter what I do, I power off/not, it'll automatically turn off, and this happened atleast 10+ times till date. So finally whenever I encounter "power off" option, which sometimes comes when I try to turn screen on or sometimes off, but never I hold the power button, but finally even If I don't click on power off, it'll power off.
And that isn't yet strange till there, normally now "Google" shows on screen when device is powered on, but here after encountering "power off" it shows "Google" and turns off.
This problem has happened to me from maybe starting a week ago, atfirst I ruled it as maybe hardware problem, cause after 3 factory resets, nothing changed, but then when I did wipe system cache and data format from recovery screen, everything got resolved. But this too remained for 2-3 days, again same problem started after it, I this time cleared system cache from recovery, and this time too it helped somewhat. so I can atleast say that it isn't a hardware power button problem, but something which I don't know what, always creating problems from software.
Now this problem has developed itself, because now the power button is kinda working okay, but now the "power off" comes on screen automatically, I can say once-twice a day, and as explained 'n' times before, once I encounter this, mobile turns off.
So everytime I've to turn phone on after this, and pray that it doesn't repeat, but it's yet going on, and i'm so pissed off by this phone, I regret buying this, honestly as till now mentioned I tried whatever I could/I knew, but nothing, nothing's helping me.
Also the problem intensifies when phone is on charge & "power off" is encountered, then the phone goes to turning off and "Google" is shown, then it shows "Google" then turns off, then it shows "Google" then turns off, and this loop keeps on going.
Finally I hope i'm as clear as possible, if someone can please help, I can guarantee any kind of format will just resolve the problem for few days only, and hardware power button problem i'm not feeling it as formats basically help it great, but anyway if I'm going wrong somewhere/need proper explanation somewhere then please tell but resolve this asap.
Phone's from India and it's been 1 year since bought and atleast a month from the Marshmallow OTA update and this problem started randomly without me doing anything I guess from a week ago.
I think you should take a look at that power button.
It's your battery. I was having the same problem with my nexus, I replaced the battery and the reboots are gone.
Mine did this exact thing a couple of weeks ago. really annoying and couldn't put my finger on it, until i got so annoyed that when it came up with the power off notification I repeatedly pressed the power button for maybe 20 times, this resolved it for a few days, though to be honest, the best advice that someone posted, was that a sharp shock to the side of the phone that the button is on resolved it, been over a week now and it's been fine.
I put it down to the case i had on it, harbouring small dirt that was getting into the button housing and interfering.
try it out, failing that, perhaps a new power button, i did have one in my ebay basket, though i don't need to go down that route, not for the foreseeable anyway.
**edit
incidentally, i went down the software route too wiping caches etc. no avail.

s8+ not turning on

guys please help i flashed lineage aosp on my s8 plus .....booted up normally but when i shut down it didnt turn on again no recovery no download mode ...hard keys restart not working,,,,, no charging..please help me....thanks a lot
khawarjaved said:
guys please help i flashed lineage aosp on my s8 plus .....booted up normally but when i shut down it didnt turn on again no recovery no download mode ...hard keys restart not working,,,,, no charging..please help me....thanks a lot
Click to expand...
Click to collapse
just keep on holding those butons for download mode
it will take you there eventually
The Samsung Galaxy S8 is one of the most powerful and good looking smartphones available on the market right now. I know, the S9 was recently introduced, but the differences aren’t that big, so a lot of people are getting last year’s flagship, for a very good price.
Let’s say that you’re one of them and got it for a while. Suddenly, the Samsung Galaxy S8 won’t turn on, no matter which method you use to unlock it, raising some serious question marks. Is the phone broken? Is something you can do to fix it yourself? Should you take it to a service?
We will find answers to these questions together, through this guide! But first, let’s see which are the actual reasons why the phone won’t turn on.
Why is my Samsung Galaxy S8 not turning on?
Like in most cases, there are various problems causing this, both of them split into two categories: software glitches or technical issues.
Fortunately, there’s solution almost all the time, except when a part of your phone is damaged and needs replacement, so you need to take a phone to a service and leave professionals to take care of it.
Now, let’s see the steps you need to follow if your Samsung Galaxy S8 won’t turn on.
Unlock it correctly
It’s possible for your phone unlocking method of choice to have trouble responding. If you don’t have any authentication method, just hit the Power Button correctly and see if the phone turns on.
Many users reported that, sometimes, pressing it improperly may cause the device not to turn on. Yes, it sounds weird, but it’s something you can try.
If you opted for fingerprint authentication and the phone doesn’t turn on, make sure you’re placing your index (or whatever finger you’re using for unlocking) in the middle of the scanner. It should unlock in a few seconds. Otherwise, the scanner will vibrate for a moment, which means that your finger is not placed correctly.
If these methods don’t work, then move on to the next one.
Perform a soft reset
If you can’t unlock the phone properly and the screen remains black, a soft reset is the next thing you can do. Basically, you’re ruling out the possibility of the firmware crashing or other minor software issues.
On older Android handsets, this was done by taking of the battery and putting it back on, but since the Galaxy S8 power pack is not removable, you’ll have to use another way. Specifically:
Press and hold the Power Button and the Volume Down Key for around 10 seconds
Wait until the Samsung logo shows up on the screen
Give it a few moments until it boots completely
After this, unlock your phone, then try turning it on again and see if the issue appears. If it does, it means that it’s a bit more difficult to fix than you believed. If it works properly though, but you still encounter this issue once in a while, it means that there’s something wrong with the phone and you should try get it replaced.
Charge the phone
Before worrying, you must rule out the scenario in which your Samsung Galaxy S8 won’t turn on because the battery hasn’t been charged.
Therefore, using the charger the phone came with, leave it plugged for at least five minutes and see if the charging icon appears and the LED indicator lights up. If both of these are present, leave the phone charging for a few more minutes and try powering it back on. It should be ok.
If the Fast Charger doesn’t seem to be charging the phone, it means that it has some problems on its own. Try another charger or switch the wall adapter.
On the other side, if none of these signs are showing, it means that the phone is not charging and there’s something messing with it, like a faulty app, for example. If you’re in this situation, proceed to the next step.
Boot the phone in Safe Mode
This method will power up your phone just with the stuff it has out of the box, so no third-party apps or anything else you installed.
In order to put it in this mode, follow these steps:
Presuming that your phone is turned off, press and hold the Power Button past the screen with the phone’s name and model
As soon as you see the Samsung logo appearing on the screen, release the Power Button
Right after this, press and hold the Volume Down key
Continue holding the Volume Down key until your phone finishes restarting
You should now see Safe Mode written in the bottom left corner of the display
Release the Volume Down key
Now you can start uninstalling any app that causes your Samsung Galaxy S8 to not turn on. Start with the ones that look suspicious and see if the issue persists.
Boot the phone in Recovery Mode
Finally, there’s one more thing you can do to troubleshoot the device and see if a software glitch is indeed the reason why your Samsung Galaxy S8 won’t turn on.
Press and hold the Power Button, Bixby Button, and the Volume Up key at the same time, until the phone vibrates
Once you feel the vibration, release the Power Button, but keep the other two buttons pressed
You should now see the Android Recovery screen
Release all keys
Using the volume keys, select the Clear Cache Partition option
Confirm your choice using the Power button
Wait for a few moments, until the phone restarts
If none of these are working, it’s definitely an issue with the screen itself, meaning that you need to have it verified.
Check your phone’s screen
First thing first, you need to inspect the display for any potential damage. Make sure it’s not chipped, cracked or damaged. Such issues can completely affect its functionality.
If you can find any of these on the surface of the display, take it to a service and have it replaced. However, it the issue persists and the Samsung Galaxy S8 won’t turn on even after getting a new display, it’s better to get a new phone, as long as you’re covered by warranty. You’re definitely dealing with a complicated hardware issue.
Hold powerbutton and volume down pressed for 10 seconds. This will reboot any locked s8, maybe it's stuck at boot after your flash.
Verstuurd vanaf mijn SM-G955F met Tapatalk
Bisquit-02 said:
Hold powerbutton and volume down pressed for 10 seconds. This will reboot any locked s8, maybe it's stuck at boot after your flash.
Verstuurd vanaf mijn SM-G955F met Tapatalk
Click to expand...
Click to collapse
brother thanks i left phone for overnight next day somehow it got into download mode ......flashed twrp and restore my old rom......

Nexus 5 having random reboots every 8 mins or so

So my nexus 5 had the power button problem so i opened up the phone and cleaned it with alcohol and blew air, it would work but then start having random reboots every often. i have tried using a custom recovery, flashing a custom os, rooting the device, remapping the power button to volume buttons(which just makes it reboot even more) , tried cleaning the power and volume button 3 times again but still having random reboots.
please help me I've heard that this may be a power button problem and that i might need to replace it but isnt there any other way or is it some other problem?
also the phone heats up over 65 degrees due to constant reboots
currently on stock 6.0.1 .

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