Hawk, when I read your first paragraph (before the edit), I immediately thought of overheating because my old PC used to do it all the time. Even if it's within specs, your video card (or processor, but it's usually the video card) is getting too hot and your PC shuts itself down as a failsafe so it doesn't break. Obviously it happens most when you play newer games because the video card is working much harder than usual which increases the temperature.
Usually the best way to solve it is to just open up your PC and give it a good clean with a vaccum cleaner or can of compressed air. Sometimes you have to remove the fans from the processor and graphics cards to get to the dust caked in the heatsink (they just screw right off, it's easy). But yeah, give it a real deep clean, and then try again. Depending on how much dust is in there, cleaning it out can reduce the temperature of your PC drastically.
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