I took the phone on a contract with three network two months ago upgrade. the problem started two days ago. several times a day phone locks the screen in black and do not want to unlock it, but you can hear in the background sounds and light up the navigation buttons. 10 seconds after the phone reboots itself. Today I did the upgrade android 5.0
Device: Galaxy S5 (Global / Snapdragon)
Region: XEO (Poland Open)
BUILD DATE: 12/01/2014
but still the same problem. I dont have insurance on the phone. what can I do now ?
Lock at photo this it start my phone, sometimes ist like that.