that does not make much courage to say it in german ...

i have a similar issue. because of your post i tested the RAM of my PC. it is a G.Skill kit with 2 x 16 Gb. Memtest86 stopped because of too many errors.

cpu, mobo, ram and psu are just a week old. on the ryzen 2 BG3 worked like a charm, no crashes, but the cpu load was at a constant 80 to 90%. now on a ryzen 7 7800x3d, the cpu seems to be bored, but BG3 crashes seconds or minutes after the RAM has around 30% of workload. i'm tryin to get an exchange to higher quality RAM from the shop i bought the stuff from. hopefully this is the issue.

the steam deck has also issues with BG3 at the moment, because it keeps starting with Vulkan, even DX11 is chosen. i have enought to do with this gg