hmmm, on cold boot today no problems, after reboot still no problems.
Why are you asking for conclusions from subjective and vague symptoms? Your symptoms say only one thing. You have a hard problem. You need hard facts that identify the problem. Especially numbers. Or just keep replacing good parts until something works - also called shotgunning.
Makes no difference which AC outlet your computer is plugged into. Connect an incandescent lamp to that same receptacle. All voltages are perfectly 100% ideal until that bulb dims to less than 40% intensity. That is what all power supplies do. Output rock solid 100% DC power when AC mains vary so much as to even harm the furnace, refrigerator, or air conditioner. Stop wasting time with a protector or receptacle. Your problems exist inside or after the power 'system'. A 'system' that is more than a power supply.
Now, hard facts. What did the system (event) logs report. Windows routinely sees problems, works around them, and reports that problem in the logs. Then days or months later, the informed tech addresses those failures.
Is you system from a more responsible manufacturer? If yes, then provided are comprehensive hardware diagnostics. Provide exactly for the reasons you are seeing. Test hardware without any Windows or drivers. Determine if the problem is in stuff on the left (hardware) or right (software). You do not even know that - which says how little you have learned after all that work.
Your accomplishments are quantified by what is on two lists. One is to know suspected bad subsystems and components. The other is 'known without a doubt' good parts. Above are two sources for list entries.
What can cause every strange failure? The power 'system' - which is more than a power supply. Defective power systems can boot a computer for months or years. But a tool sold to K-mart shoppers (because it is that complex) can tell you in a minute what is good or bad. And then post those numbers so that other with superior knowledge will put more items on your lists.
Posted here is what you should be asking about to have a useful answer. This only defines what you need to start asking about and what you need to stop doing. And how to measure your progress (the length of those lists).
Prime95 says nothing about hardware other than the CPU. You symptoms already said no problem exists there. Most would not understand that. Most will suggest 'do this' or 'try that' without first understanding the underlying hardware. Prime95 is an example of testing for no purpose. CPU was already on the known good list. Your unknowns are found in other hardware or software. Plenty of procedures exist. But first you must change your diagnostic strategy. Then ask for procedures that obtain hard facts with numbers.
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