I have a ChromeCast Audio and it was always fussy in connectiong to Spotify, but recentlly it got stranger. Spotify sees ChromeCast in device list and tries to connect, plays the established connection sound trough speakers but does not succsed. That happens only on some(but rather plenty) songs. When I finally connect to ChromeCast with a song that works if I switch to the song that doesen't the connection drops and Spotify Lady says that my account is used on another device.
To summerise. Chromecast plays only slected songs and on some drops or cannot establish connection.
This is annoying as this is my main method of listening to music.