I don't know if this was happened to just me, but while playing music on headphones and while connected to the car I definitely noticed that the music that was playing was a bit more muddled and not as clear. I then did a clean restore back to iOS 10 and played the same songs over and they sounded perfectly fine.
Also in regards to call quality and signal there was signal drops and the person on the other end of a phone call not being able to hear me properly.
Also in regards to call quality and signal there was signal drops and the person on the other end of a phone call not being able to hear me properly.