Roon crashes on startup after: Record Error 22

When starting up Roon I read “record error 22”. Please contact costumer support.
This message appears in a pop-up window.
This message is followed often (not always) by a program crash, means I have to restart Roon.
This process might repeat itself up to 5 times. After that Roon runs stable the whole day.

Roon is installed on a Windows PC, i7. Music files are on 4 wired 4 bay Qnap 431 Nas.

Thank you

Still, I get the Pop up Window:
Record error 22. Please contact costumer support.