Thanks for your reply.
Have now patched to Win 11. No problems here after that although I reactived firewall! Great!
No crahes in 2 missions. Will test furthermore and report!
THX!
Now I have patched to Win 11 and indeed had no freezes since patching last weekend!
Also the problem with the communication menu is solved. the reason for this problem was a program running in the background (fraps) which has implemented hotkey F1 for starting movie-record, I never use!! This F1-key is used in com-menu, so everytime pressing F1 in the com-menu a video-record started 🤬.
Result: Fps-impact and 670 GB hidden movie-file on the SSD 🤬 - oh man, what a bull....t!
This is a good example that as possible no tool should work in the background!!
Simpit's post in 5 crashes in 5 mission was marked as the answer