after a day of testing there was no further crash, seems like shadows really triggered the problem.
Thx SdRohan and the other users for finding the problem.
I found another bug. I use Windwos explorer with the preview window so i don't have to open files.
Several times the preview window just froze on me, i can't scoll through the file, neither with my mouse wheel nor the sidebar.
I can still scroll through the folder without any problems and if I select a different file the preview window also show the new file, just cant scroll through it.
I think Cursor FX is the problem because when the mouse pointer ist over the preview window, Canterburry changes to the standard windows cursor. I assume there is noch animation/Image in Canterburry for this specific cursor. If the problem with scrolling occurs the cursor stays the same and does not change to the windows cursor anymore.
Closing and reopening Windows explorer fixes the problem for some time.