I continue to receive this error message on my iPad, iPhone, & iMac. My Sonos Connect is < a year old. I have contacted support via phone & email multiple times following all instruction given, yet the problem is not corrected. Email support is slow to respond. Searching online, I see that many users have had the same problem, but I have not found any published resolutions. Should I reset my Sonos Connect? That's the only thing I have not tried.
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