Hello again,
After some deep diving into windows error logs i found the issue for the crash, which is now fixed.
It looks like somehow the file Caucasus.surface5 in "DCS World OpenBeta\Mods\terrains\Caucasus\Surface" got corrupted.
After i deleted the file and let the "DCS_update.exe repair" command redownload the file, the crash is now gone and the game runs smoothly again.
I'm pretty sure that Windows messed the file up somehow as the error message in the Event Viewer was
I checked the drive over the last 2 days and it's in fine health, so i blame this one on Windows.
Anyway if someone should run into a similar problem, this might help.
Cheers!