The information you present is a bit vague to be quite honest.
Can you give us more information? What exactly does your computer do? Does it respond after awhile? Do you have to turn it off and turn it back on? Any sort of error messages or anything?
For example, my computer will randomly crash (not freeze, crash) without warning, it's not a BSOD either; screen just goes black and power supply has to be turned off and back on just to get it to run again.
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