You might check for overheating issues. Anytime I hear about a computer consistently crashing after x minutes of play, this is one of the things I look for.
Try opening up the case to provide a bit more cooling, and visually check to make sure all the fans are working. You may also want to try dusting out the innards with a can of compressed air. Check out the individual components to see if any of them are radiating excessive heat (don't touch them while they're running).
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