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You raise a good question. I don't know, but I will think about it. When you say reboot, do you mean a Windows restart, or do you mean that you have turned off the PSU?
I can elaborate on freezing issues endlessly. Look up thread I've started on my profile - took almost a year to figure out my freezing case. My pc could work for weeks without a freeze then out of nowhere like spiderman I get freezing everyday. Unscrewing cpu cooler mount helped me the most, but eventually it froze again. After fixing cpu socket pins I finally have no freezing for months now. Could you tell they're misaligned? Asus technicians found nothing during service.
I'm with you DragDay7, I think something hardware related is wrong. Either the CPU/dirt/pins, cables, bad connection, short circuit between the motherboard and case, bad PSU, bad CPU, bad motherboard. Something cannot be right. Wish I knew what it was. I think that you are going to have to strip down the PC, rebuild and check everything, very carefully 😞