We replaced our router and have read through the message boards/followed the app without success. An Ethernet connection is not an option due to installation distance (on wall with all wires behind drywall).
Is our best and only recourse a reboot? I have updated my Sonos app/etc.
The simplest solution is to use the same SSID and password as your previous system, then no changes to Sonos will be required (other than a reboot).