I’m still encountering the issue. After a few days of usage the thing becomes offline. I have done some googeling and found a similar problem exists in SONOS binding: Too much time before a Sonos thing becomes definitively ONLINE
After trying the workaround to manually restart the jupnp bundle also my device became available again. My remaining problem is, that I can’t effectively find out the situation when the thing is really offline as it also becomes offline for a short period of time when I switch off power, and comes back online after rediscovering the device, because it is not really switched off and network communication stays alive. Does the 3.0 binding use newer version of jupnp? My 2.5.11 openHAB installation shows jupnp version 2.5.2.
