Hello @Sigurd_Ruschkowski,
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.
Also, if you are able to submit a set of your Roon logs by using these instructions they might provide further clues as to the issue.