I had a problem like that at one time on another game
The game was so graffics intensive that the card started to go buggy once in awhile on me. Come to find out it was drawing more power from the power syply then the card originaly called for.
I went with a Duel ball bearing fan 950w power suply that could run duel pci express sli card's easily and all the porblems stoped. This also allowed me to upgrade to 2 cards in the long run and still no more problems like that.
Seeing I run Nvidia cards only maybe this will help you out?!
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