Problems with Chromecast via Android app

I have several Chromecast speakers and Chromecast Audio which I cast to from the Deezer Android app. This mostly works well, but there are several issues:

• The phone often gets disconnected from Chromecast, while the music keeps playing. This is fine as long as I don’t want to skip a track or something. When I reconnect the phone, it will often (but not always) jump back in the playlist to where it got disconnected.
• If I pause the playlist while casting and then start it a while later, it will jump back several tracks (about 10, at least 30 minutes of music.)