Since couple of weeks, my speakers (era 100 and Sonos One) keep disappearing in Sonos App (ios and ipad, did not try mac) and canoot be found in the app either. The only thing I managed is to unplug and plug it again, it will apprear in the app, but only for a short time. Later it will disappear again! And I cannot use airplay to play anything on Sonos speakers, as they dont show up in the list.
I tried, as someone suggested, turn off “private wifi address”, but it did not help. What can I do? is it a bug introduced in the last update?