Have had this problem on and off for years now. It’s gotten REALLY bad lately. Have contacted support directly and they weren’t much help.
I cannot connect to SiriusXM for days now. I also can randomly connect (yes, I said connect as it mostly won’t connect) to play YouTube Music as well. I’ve shut everything down (multiple times). Everything is upgraded.
Only way I can get YT Music to play is by trying to start with a different speaker to add to a group. Most won’t play at all and I find one which will (sometimes).
I am convinced it has to do with your horrible WiFi implementation. Why? Because all of my speakers except for one is connected via wire. I had WiFi disconnected but it obviously tries to do something and eventually fails. When I called support they made me re-enable WiFi (even though I’m not using it). No, it didn’t help.