I am going to side with waco on this one and say it is a dying motherboard. Foxcon boards are usually a bad idea for a system like yours, and this situation does have some tell tale signs of bad voltage regulators.
I would say the quickest way to find out what this is, is go to your nearest tech store and buy a PSU. Plug it in. And if you experience the same issues, return it and you know the motherboard is the issue. If it fixes the problem, then you can keep the new PSU.
Super simple
i went to the nearest tech store but didn't have the money to buy a 320w "biggest they had & not p4 compatible" power supply for $110 waaaay over priced














