Repaired windows, took me almost all day because some software I use next to the sim needed to be installed again. Have it all up and running now.
I could do 2 test flights and the performance was great. Allthough it’s a bit soon I had no CTD yet…. offcourse need more flights to get a better insight but it looks promising 
(also need to see it over the next few days as the sim seems to run better from one day to another)
Anyway a big thanks for your advice …cheers
Edit: did 3 more flights and still going strong so I think reparing windows did the job. Allthough it’s still a bit quick for a solid conclusion this give me already much more conference… before atleast 3 of the 5 flights would CTD