Really a sticky problem. You will have to try several things to see if you can find problem. I would first see if you have a program with a memory leak. I would check to see if your CPU is getting hot. Look into your system logs to see if that will give you any help, Try updating your drivers one at a time. Check to see if you have the latest BIOS, if not update. It will take some time don't shotgun the problem as it can cause additional errors and you won't know what to set back.
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