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Well it is either the PSU or motherboard. The motherboard can send a signal to shut off the PSU. I would try and find a PSU you can swap to test.
I have one sitting next to me I just bought, was waiting to install my new AIO cooler, memory & fans that will be here Monday. Got an RMX850, This is all in preparation for a 3070 or 3080.
I really thank you for your help!!
Most of what I said initially!!! Swap gpus, go back to stock (he said he did already), swap psus, lol!
What does the windows event log say? Does it show any reason for the unexpected shutdowns?