Hi @Egbert_Braam ----- Thank you for the feedback and sorry for troubles here. I have a good idea of the issue you are experiencing based on your report (kudos), but I would like to understand exactly what you are working with as well 
I see from your post:
- Roon core on a Synolgy DS415+ w/ Audio Station installed and active
- Windows 10 laptop acting as a remote
May I kindly ask you to please expand on this information for me, as seen here. The more detail you can provide about the gear you are working with and what your network configuration is like, the easier our evaluation process will be.
Thanks!
-Eric