I have this same issue with all of my TVs. Next time this happens, restart jupnp and see if it resolves the issue before doing any config changes. SSH to the console on port 8101 and run “bundle:restart org.jupnp”. It can take several minutes for this to cycle through. There is an ongoing issue with jupnp which seems to randomly crop up and cause things to fail. See Too much time before a Sonos thing becomes definitively ONLINE for similar with the Sonos speakers. https://github.com/openhab/openhab-addons/issues/5892 is the bug ID for jupnp.
