Question Gigabyte X570S Aorus Master: sudden no POST issue ?

[BrokenProton]

Ive literally swapped everything but my motherboard, but I REALLY don't want to have to RMA my motherboard if I don't have to. My PC will post with a different graphics card for maybe a couple minutes, then stop posting. I can hear windows but it makes the USB disconnect and everything stops working. Ive changed the GPU, drive, RAM, PSU, CPU, and nothing is fixing the problem! its at the point where it'll go to post code AA, then kick back into a boot cycle again. Im exhausted and my computer has been MIA for almost a month. something tells me its something software but clearing CMOS, or doing bios flash does nothing.

CPU: 5700x
GPU: EVGA 3080 Ti
MOBO: X570S Aorus Master
SSD: Samsung evo 870
PSU: 1000w corsair

please help!