Today I reinstalled my Windows 11 via recovery usb stick, with a clean user profile, clean registry, clean driver installations, etc.. -- and the game still continues to crash after a few minutes.

At this point I choose to believe that I was simply lucky for the last months since August to not have experienced any crashes of BG3, and that I must simply forget the idea of playing it again any time soon. It's simply to unstable for that at the moment, with no hint of a solution in sight, thanks to the near useless log files that give no hint whatsoever why the game simply closes/crashes.