I have recently purchased a Sonos Roam (Kitchen and garden/garage) which I have connected to a Sonos One (Back Room) and SL (TV Room). When all connected in the house everything is fine. However on using the Roam in the garden via WiFi Extender it drops out and I get the following message.
“Some Sonos products are using a WiFi Extender. If you include one of these in a room group, you won’t be able to play music in that group. To ensure playback in all grouped rooms you’ll need to permanently wore a Sonos product to your router”
I did connect the SL to the router however still got the drop out and above message.