Still the same concern than below with my new iPhone 5C with last iOS 7.0.6
Connect my iPhone 5C to my car (BMW X5 from 2008 with Bluetooth : Bluelogic BT-BMW01) and using waze app with voice via bluetooth.
The first few minutes it works ok and the voice is heard on the car speakers over Bluetooth. After a certain time the turn-by-turn directions is not heard any more over bluetooth.
When it happens, I launch the control center and the music player is playing music (position play). If I pause the music, the turn by turn works again over bluetooth. This problem can repeat several times during the trip.
Another concern to notice : the bluetooth is not perfetly synchronised with the turn by turn indications (bluetooth launching a bit after the turn by turn indication starts) leading to missing words in the indications ....
Bluetooth works ok for phone calls on iOS.
My car integrated bluetooth works without problem with other phones (non iOS). The chipset of my car bluetooth (Bluelogic BT-BMW01) is Parrot CK5050new.
please apple guys, check this issue and resolve in the next release.
stephane