Sorry for bad grammar, not good at english.
Hello. I've got Galaxy SII GT-I9100. It never happen to me, but now it started. When playing a game (clash of clans, dead trigger 2) it gets a little bit hot near the camera (as always), then the screen starts flickering and the phone goes off. When I turn it back on, the battery loses about 50%. I've tried flashing stock galaxy SII firmware, cm10.1 stable and now I'm running cm11. The problem doesn't go away with any ROM. I really need help.