Answered
sonos 9 bug - unresponsive
since upgrading to sonos 9 the app becomes unresponsive on the iphone if you switch to another app and back again , or even just press the home button , the music continues to play without a problem but the sonos app screen is no more that a picture on the phone. The only fix is to "close" the app" by swiping up and re open the app
