Quote Originally Posted by a completely inoffensive name View Post
Same thing happens to me. It is definitely the alt tabbing. I can play for an hour straight as long as I don't alt tab out. After maybe 3 or 4 times of alt tabbing, usually my game will crash within 45 seconds of the last alt tab.
Alt-tab is the kiss of death. You can do everything needed from windowed mode except reach the desktop icons behind the game. A minor price to pay for the huge increase in stability.