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Try this for me - uninstall the AV software, reboot and re-test for a few weeks. I've seen AV do some very funny things over the years.
If you can, unplug the PC from mains AC, pop the sides of the case off and check the caps (capacitors) to see if they're bulging into a dome like structure on their top.
Cheap PSUs can do all sorts of weird things too, I *never* recommend going cheap when it comes to PSUs.
Another thought - reboot into safe mode and keep it like that for several weeks and see if it BSODs. if it doesn't, then it's almost certainly a driver or software related issue.
Curious to see what the outcome of this problem is.
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