The temp is normal, i've checked this. Its not overheating. Some other games push my GPU temp higher then LFS, still no crashes.
I've found posts on the internet, that some nvidia drivers are buggy, causing similar crashes in some circumstances. The problem is, i cannot use newer drivers, because when i install them the program called reason, that i use for music composition, does not start. A known, still not fixed issue. So, if this is really a driver crashing, then i'm stuck with this problem..