Hi @Erik_Kupperman,
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.
Are you using the latest version of Roon? You can check this under Roon Settings -> About and it should list Roon build 571 there.
I would also try to reboot your Core + Networking Gear to see if that sorts the issue out.