I have 8 Sonos players in my house (all Controller 2). Everything has been perfect for many months. However, things have been acting strange the last week or so. A couple of players will show in some controllers and not others. I can ask Alexa to play from that player, and it works without any interruption. The player will show up after reboot, but then drop off a few minutes later. I tried many reboots, then I did the nuclear option -- unplugged all 8 players, rebooted my router, plugged everything in one at a time. Even did a factory reset on a couple of the players that drop off the most. Same issue…
I confirmed with my router (Unifi USG) that the players all have a reserved IP and their signal is > 95%. I’m using wireless all around. There is little noise in my area.
Other strange on is that some controllers will show all, others will show all but one player, still others will show all but 2-3 players. All players will play fine if I ask Alexa to play, but I can’t use the controller (Mac desktop, iPhone, and iPad).
To repeat, this worked perfectly for months. I didn’t change anything related to my network.