Yet again I re-installed My Music onto Sonos. It lasted two days and has vanished yet again. Also, although the app shows the Roam is playing, there is no sound and the app can't detect the Roam to attach it to another room.
CEO incompetence is often cited as responsible for this car-crash of an app. Perhaps alternatively, it is their desire to actually drive people crazy with this deliberately appalling pile of junk.