I have had issues with Sonos and the new app updates for a year now. I finally persisted in ringing ‘Christina’ tonight. We removed stereo pair in the lounge, the Move and the Sub. These were then merged with the Sonos Arc and diagnostically tested each time. The Move was glitching with the system and is not meant to be used in a ‘cinema’ environment. I can now manuaaly merge if I wish but it might still glitch the system. The router Channel problems were linked to me using the Sonos Ones as a ‘stereo pair and NOT surround speakers. So, I selected this and hey presto all is well! The S2 app has disappeared from my MacBook Pro though? And, there’s no replacement app there presently?! Magic powers.