Music stopps after 3 tracks automatically?!

[Ro18bin87]

Im hearing music in my car with my Samsung Galaxy A5 (via aux or bluetooth) and the music stops automatically (app is shutting down) after 3-4 tracks. So I have to restart the app. I already uninstalled the app and downloaded it again, but nothing changed. Software and all the other stuff is updated. 

Does anybody has the same problem and how can I solve that? Its really annoying.. 😕

Thanks in advance!!