check for poor ventilation, maybe add another fan. Also, check the voltage output of the power supply, it may not be providing sufficient power. Are you getting any type of error message? Might restart in debug mode and check for trouble spots. Is the hard drive failing? Might run a few tests on the hard drive. If I think of something else, I'll add a reply...you did check the RAM and all additional peripherals (video adapter, NIC, etc.)?
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