I've had this problem twice in the last week with my Aorus Master 3080. Got the GPU new a few months ago. When I'm playing a game, both my monitors would go black and the GPU fans would ramp up to max speed. I end up having to hold down the power button to shut down the PC. Temperatures are fine, GPU hovers around 60-70c under load, 40c idle. It seems to happen very rarely, and I get no artifacts or any other issues when gaming . Relevant specs below.
Aorus RTX 3080
Ryzen 5800x3d
Aorus b450 pro motherboard
Corsair Rm850x psu
Aorus RTX 3080
Ryzen 5800x3d
Aorus b450 pro motherboard
Corsair Rm850x psu