Hello,
In recent weeks Deezer is not connecting well to my Sony WiFi speaker. Spotify does it and so does YouTube, so it seems to be a Deezer issue.
It takes a long time to connect and then, if once connected, it lags a lot. Sometimes the app seems to detach from the speaker and the speaker keeps on playing the old playlist, but I can't control it anymore and the only way to stop the music is to manually switch off the speaker.
Very annoying, if not solved I'll have to cancel my family subscription, I'm afraid.