Have you sent in a diagnostic after reopening the controller, and called Sonos?

No, I was hoping it was a known issue and to avoid 1st line support. Just been through the chat now.... Pointless chatbot then eventually 1st line who power cycled all my speakers ..... Why, it's clearly an app issue ... Then said I have to call support line during working hours. I preferred the days of emailing them....much more convenient.