I'm having the same issue. I'm also using the new drivers. I can play for a long time before it happens. The machine is running cool, as is the GPU (I'm almost completely water/gel cooled).
My specs are (in case it helps):
i7-2600K - Stand clock w/Turbo mode
GTX670 4GB (EVGA) - Standard clock speed
16GB DDR3 RAM (running at 1333, non overclocked)
Realtek Audio (onboard the Intel Extreme DZ68BC) running latest drivers
I'm not using a controller, just mouse and keyboard. I've unplugged all USB devices (including the wireless XBOX controller).
I'm tempted to revert the drivers and see if that helps.