I have 2 sonos speakers. I can cast from my phone using google play music (GPM) to one speaker, but not the other. When i try to cast to that speaker, i can see that the casting icon does not connect. I know the speaker is working since I can use another source to play music. This was working the other day. But for some reason it has stopped. The only thing of note i can think of, is that i was experimenting with that speaker on using line-in (wired) to play youtube music from my phone. That worked but it seems that casting has stopped working since then. Very strange. I've restarted the speaker and the phone and still cannot cast to it. Any suggestions on troubleshooting this issue? Thanks.