I set up my speakers on a spectrum w6 internet connection and sonos app on s24 samsung phone. All the speakers were there and working properly. After several hours the speakers are no longer displayed in the sonos app but still work individually on wifi connection (Move/One). I restart phone and all speakers show up again but disappear after several hours.
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Spectrum router caused all the problems with mine. I kept their modem and exchanged the new "latest" router Spectrum gave me with a TP Link 4 Mesh ($90) and all works now. Fought same thing you were for 2 months. I finally found something in the Sonos site that says Spectrum routers don't work. I set up the TP Link, gave it a new wifi name, got it set up, then renamed it to the old wifi name, and all my devices found it. With Sonos, you will need to go back and find the newer speakers (ERA, SONOS 1) but my play bar and sub automatically were found. I can't believe they don't do a mass email to account holders with this tip.
Thanks, will look into this further.
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