Hi,
In order for Roon’s @support team to better assist you, please provide a brief description of your current setup and the nature of the issue using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so they have a clear understanding of how your devices are connected.
In the meantime what troubleshooting steps have you tried?
I’d recommend rebooting the Roon Core and all your network equipment (Router, Switch, etc).