I am sharing here my customer frustration. I change my Wifi network. It took me 15 seconds to update my google devices, 10 seconds for Alexa devices and I am still troubleshooting my Sonos after 2 days.
I have the exact same problem than the case below but unfortunately cannot connect my sonos to an ethernet cable. For a Wifi sound system it is incredible that the product is not better tested and the app support is very light.