If your computer is old or old ish it may be overheating due to dust, best take the side case off pc and have a look at your heatsink see if its clogged up with dust if it is take it out and give a good clean. but u not given much information....
it just rebooting with no error or warning? Just strait to black screen then rebooting windows? Maybe check your bios for what temperature your hardware is running at.
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