Since you’re running macOS, the behavior you’re seeing is consistent with the newer, stricter Local Network permission controls in the recent macOS releases.
Please try the following steps:
Open macOS System Settings → Privacy & Security → Local Network
Make sure Roon and Roon Server are both enabled
Even if they are already enabled, please toggle them off and back on
Fully quit Roon Server from the macOS menu bar / task bar
Reboot your Mac
After reboot, launch Roon again and check if the devices is avaliable again.
If that still does not help, we can take a look over the Roon logs, you can access them using these instructions and you can upload them to the link below and let us know once uploaded:
We’ve not seen any account activity or responses on this thread in over a week and we want to make sure you’ve found the support you need. Please reach out if you’re still experiencing connectivity issues on this device.
Here are some resources that might help in the meantime:
We’re going to allow this thread to auto-close at this time due to inactivity. Please reach out in a new tech support request if you’re still having issues and we’ll reactivate the topic thread or merge threads accordingly.