have you overclocked your cpu and also have you done stress test to see if it runs at acceptable temps? because if you have overclocked it to much it may be overheating and crashing your game like you say it tells you if that is the case maybe try lowering your overclock a little bit and then testing it to see what temps your getting id say (keep in mind im an amateur overclocker) if your cpu after stressing it for 10-20 mins is running at 75c- 85c (85 being the ABSOLUTE max i would go) then try it again hopefully i could be of some help although im not exactly the most knowledgeable person on this forum by any means