Tough one.... if it was me, I would be suspicious of three things.
Virus
Mal-ware
Disk Issues
Do you have current virus software?
How about Mal-ware? I have been caught by some very annoying spy-ware that took quite some time to clean. I have had luck identifying and eliminating with Malwarebytes.
Is everything else running ok? If yes it is likely not a disk issue, but it never hurts to defrag, do a disk check for errors.
Not sure this will help alot, but it is how I would start the investigation.
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