Galaxy s6 freezing and turning off randomly.

[haliti21]

All started a week ago, i left my phone charging and when i saw it was turned off and couldn't turn it on. I was able turn it on only by holding the volume down for 10 sec then pressing the power button. Now it frequently freezes and goes off and it doesn't turn on with the power button, only with volume down + power button.

 

[B. Diddy]

Try wiping the cache partition: https://support.t-mobile.com/docs/DOC-21095

 

[haliti21]

now it's not starting at all even with the charger

 

[B. Diddy]

Have you already tried just pressing and holding Power for at least 10-15 seconds? Do you know if the phone was charging successfully up until it stopped turning on?

Unfortunately, it sounds like some hardware component failed--perhaps the Power button, or the battery, or (worst case) the motherboard. You'll probably have to bring it to a repair shop, assuming it's no longer under warranty.

 

[Goushique]

Does your phone boot to recovery mode. Press and hold the Volume Up + Home + Power keys together.
If so then do a cache and a full system wipe.
If it doesn't turn on at all then leave the phone untouched, free of dust, for a week, and then plug it in and leave it on charge (even if the phone doesn't turn on) for 30 mins. Come back and check if your phone is working.

I had a similar issue and the last one worked for me!