So I haven’t come across this problem before. I recently bought a new era 300 I just did all the set up and added to my system. It will not play music by it self.  I have to start playing music on another device and add the new speaker to it to get it to play.  And then once it’s playing if I unselect the other room it wilL shut off the new speaker.  Now if I start a group with the new speaker and add something to it.  It will not work.  It has to be added secondly to another group for it to work. I have never had a problem like this. Has anyone ever heard of a problem like this