Every morning (!) my two sonos play: 5 (2) sounds like someone shouting in an empty oil barrel. I need to remove the stereo coupling - and afterwards create it again. Then everything is OK - untill next morning.
I’ve removed the automatic updating, but that didn’t solve the issue.
I can’t think of anything offhand that might cause this behavior.
Why not submit diagnostics from both of the states that these devices are in, and call Sonos? I’d imagine there would be some sort of indication that they could see when comparing the two, and let you know what’s going on.
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