I am having the strangest problem grouping rooms. I have eight Sonos speakers in eight separate rooms. They are a mix of Era 100 and 300 speakers. Four of each.

I can group 2 rooms on a single Spotify stream but if I add a third room, the third room doesn’t play. The same as true if I had a fourth fifth sixth seventh or eighth room.

If I begin with room A and B and then add room C room A and B play but room C does not. If I change the group to group room A and room C they will play, but if I add B. to that group, it will not.

To make it even stranger I can group room A and B on a single stream and then separately group room, C and D on a different stream they all play but separate streams, but I can’t have all four rooms on the same stream.

this is true for Sonos Radio, Spotify and Amazon  

I can see every speaker in the controller and on the backend I can see every speaker has an IP address and can be pinged.

Support has been little help  

Any thoughts?