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While watching TV or even listening to music, the 2 play ones, and sub will cut out for about 20 seconds. The play bar will continue to play. Then the surround kicks back in. Happens about once and hour. The rest of the house keeps its audio, so it's isolated to the surround. TV is pushing Dolby through the optical connection and HDMI. Anybody???
There's a couple of potential issues. It could be as simple as Wifi Interference of some type.



Or, it's possible that you've got a duplicate IP address issue that would have been exposed by one of the recent software updates.



Simple fix is to unplug all you Sonos devices from power. Then reboot your wifi router. Once it's back up, plug in one of the Sonos devices....and choose the one that you have plugged in to the router with an ethernet cable, if you have one. If not, choose the device that's physically closest to the router. Wait a minute for it to finish booting, then move on to the next speaker and plug it back in. Repeat that last sentence for all of your speakers, and you should be good to go.



By the way, you can assign all of your Sonos devices a reserved IP address in your router, which would be effectively the same fix, and would keep the issue from recurring again in the future.