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This kind of thing can sometimes be trouble with the Advanced Power Management.
This is the stuff that allows your computer to shutdown and switchoff automatically without having to physically press the power button. It is also the thing in the Operating System that decides between restarting and powering down. As was suggested, get the various patches and stuff for the operating system, but first, get the latest drivers for your motherboard, just in case they have a bug in them that causes the wrong command to be sent to the power mechanism.