[wetwarev7]

Just a shot in the dark, but do you have a Saitek joystick or controller?

I've had intermittent resets like you are describing due with several different types of Saitek controllers.

It seems more prevalent if you use updated drivers, rather than the ones that come with the controller.

Otherwise, if the problem persists, I would check to make sure the CPU fan hasn't vibrated askew...