I have been using Spotify Premium with my 5 different Sonos 1 speakers for a good while now. The speakers are located in different rooms each.
From the Spotify desktop app I suddenly don't see the speakers anymore, except for the one in the same room as the desktop app. From my phone app this isn't a problem and see them all.
It all worked fine until a couple of days ago and nothing has changed in my house... same modem/router/wifi network. same speakers on the same locations. same everything...
I have an alarm set every morining at 8.00 am to start playing radio on all speakers and stop it at 6.00 pm (18:00 hours). This works fine and since I don't have the speakers paired it means they are all seen by the sonos thingy that is connected to the router.
I'm at a loss... :(