Hello! The warranty on my phone is over, and there was a very serious problem.
Every 15-20 minutes (or totally by random) picture on my screen freezes for a minute or more. I can turn off screen, then wake phone back and... See the same picture! But, I can enter pin, unlock phone and make call, in other words I can still use software buttons.
If I shut down phone bu using pwr+volup buttons and turn on it again, I can see wide (~1cm) line of randomly colored pixels, like white noise, on the bottom of the screen.
It happens after 6.0.1 update.
What it can be and whether I should completely reinstall the firmware?
