Since Season 2 - Crash to Desktop with no errors

As stated in the title. I start a game and can play it for 30 seconds to 5 minutes. Then the game crashes, as if I had pressed Alt+4. No error message, nothing.

I have reinstalled Anticheat, deleted everything and reinstalled it, verified the game files – nothing helps.

Win 11, 5090 RTX GPU, 9950 x3D CPU, M.2 SSD as files location.

What can I do? It's really dramatic when you simply have no options left – everything worked wonderfully in Season 1.