Apologies for the difficulties here, @Rudolf_Kopmann1!
So we can better assist you, please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.
Has this problem always occurred with TIDAL & Roon, or is this a new behavior that you’re seeing?
In the past we have seen Google DNS help with similar reports. Can you try using Google DNS and let us know if you notice a change?
Thanks!