New Error in Assetto Corsa after playing 20min

[Mabuck00]

Hi Guys! Like the title says, i got a problem with the Content Manager.

Im on the newest CSP (1.7.8) and on the newest Content Manager.
Everytime when im playing, i get this Error about 20-30 minutes after. (see Picture)

Now im clueless of what i could do. Because i tried ->
- Whole Computer Reset
- Updating/Downgrading the CSP Software
- Tryed it without PP Filters
- Tryed it without any Car or Track Mods
- Tryed it with the Virtual Mirror
- Tryed it with another Launcher -> original and the Content Manager (original one)

PS: Sorry for the bad english! Im a young Student and i live in Switzerland!

Hope y'all can help me! It really sucks to just always play like 20min and then it crashes while in a race.