check your power supply and your ram. If your powersupply is to small it may be powering down when it overloads. For your setup you should have at least a 400w if not a 500w power supply. As for the ram, I had the problem like that when one of my ram chips went bad. Pulled each one out one at a time and found the cause of the problem. I agree also on turning off the auto reboot thing.
|