I use my Nokia Lumia 800 with the bluetooth device BH-111 (see image). It works great and it easily takes both Spotify (streaming music player) and Marathon (running tracker) audio output at the same time.
After a much needed run (I'm a professional developer) I disconnect bluetooth - but get no media output from the phone. It doesn't matter in which order I disconnect bluetooth (1) shut off BH-111 or (2) turn bluetooth off on the phone. Both actions have the same result - media output from Spotify will not play on phone speaker or phone plug out.
It won't play again until i restart the phone.
Is this a just a coincidence or does it happen to others? Does disconnecting bluetooth make audio out fail when playing media?