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cpu maybe overheating, check all fans are working, maybe a fault in motherboard. There should also before an error report log on your operating system which might give you a clue. try putting your hard drive into another pc (as a slave drive) and scan it for viruses before putting it back into your pc as the master again.
There are several possible causes for this. Laptops are notorious for dust buildup and overheat issues. Take compressed air and blast out the vent areas. If you can push enough air through the vent leading to the CPU cooling fan, that may clear out dust clogging the fan, preventing proper CPU cooling.
The next possible issue is a threat.
Boot into safe mode - keep repeatidly pressing F8 key as soon as you power on - until a menu comes up. Using keyboard up/down arrow, select "Safe Mode" (with networking if available).
Next, install Malwarebytes (free version) and perform a full scan. Also scan using your current antivirus.
try to change the source, that should solve the problem. But before try reset CMOS. (if you don`t know how to do it by jumper simple remove the battery from the mainboard for 5 minutes and then plug it back on..and after that turn on your computer and press F1 for default settings)
download memtest and burn the iso to a cd and boot from it to test your ram, it usually only takes a few minutes to see if your ram is bad or not, otherwise ive had computers with bad system boards (blown capacitors) that reboot themselves, and also computers that are overheating reboot themselves, check to make sure all air vents aren't blocked and that all of your case fans run well