At random times during gameplay C2 crashes my computer, only way out is to reboot it.

I don't know why its happening or what its happening, my screens get black and my sound stops playing until I hit and hold the powerbutton.
Must be something in the software itself, since BattleField 3 is running smoothly (though thatone is more resource demanding)

hope someone knows a fix..

im running on extreme, no vsync, DX11, 1080p