I don't know if this is the same thing or not but something similar was
happening with me for my nest devices. My phone would show it was
connected and for a minute it was connected, but then the device lost
the connection. Was driving me crazy. In m...
Well, I answered my own question. As soon as I uninstalled the google
home app and then reinstalled it, HOME found Chromecast audio right
away. I read somewhere on here you need to find an older version of the
app, but that was not my experience.