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I own two Sonos One speakers, one Sonos Move, and one Sonos Playbar. My diagnostic reference number is 1323800420. Our whole system will play for hours on end at times and then just start not working. We’ve reconnected it to the internet multiple times and ensured they’re all on the same network. It got better for a while but has started doing it again recently. 

While you wait for a response from the forum moderators, I’d try unplugging all your Sonos devices from power, then rebooting your router. Once the router comes back up, plug the Sonos devices back in to power.