Pavilion g6 Problems when gameing

Hi!!

I have Pavilion g6 2230ew,with Windows 8.
My problem is when I play same games with graphic 3d (Diablo 3,Fifa 14,Amnesia Machine for pigs) the game is runing corect ony for 5 minutes,after this time sound starts to crash,and graphic start to hang.Computer is after cleaning of dust,so its not caused of problems.

Somebody help me?? :(