Notice that on Reddit thread there's a schedule that pushes into Nov... but no mention of album art... HD banners etc…

After a couple of days it's all stable, but load up initially is nowhere as sharp as previous version and the Sonos Favs 'generate' rather than 'appear'… Hmm 

'Line in' section of 'your sources' remains hit and miss if it appears/populates on app load or not without a significant lag...

Lag is often an indication of your Sonos device having trouble connecting to your controller. 

Have you read the wifi interference FAQ?

Have you performed a simple network reset, by unplugging your Sonos from power, then rebooting your router, waiting a couple of minutes before plugging back in your Sonos? 

Have you submitted a system diagnostic within 10 minutes of experiencing this problem, and called Sonos Support to discuss it?