No one can tell you why because you haven't told us anything about your
computer. The cause could be software (viruses, malware, bad drivers,
etc.) or it could be hardware (overheating, other failing components,
etc.). Here is a link that will show you what details you need to
include in your next post so we can help you:
In the meantime, here are some general troubleshooting suggestions:
The First Question Of Troubleshooting: what changed between the time
things worked and the time they didn't?
The Second Question of Windows Troubleshooting: what is the
malware/virus status of the machine? If you think it is clean, what
programs (and versions) did you use to determine this?
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