The game can only use one GPU at a time. You will only get the benefit of two GPUs if they they are the exact same kind and i don’t even think the game is set up for SLI. At any rate, it’s not gonna work with a 2060 and a 3060ti running. I hope/think i’m explaining that right.
Are you using the Nvidia Surround or whatever or setting up triple monitors with the game settings? I’m willing to bet if the former, there is serious confusion on Nvidias end somewhere and it’s causing the crash.
Also, theres issues with later nvidia drivers and DX12. Rolling back and going to DX11 should fix the “grahics overheating” message.