I've noticed recently that when I hang up on a call, while using a blue tooth headset spotify will start playing music automatically through the headset as soon as I hang up. I am using iOS 7.1.2 and Spotify 18.104.22.168
This happens every time!
Have you checked your default play settings to make sure it's not set up somehow? Kinda odd, but worth a look.
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I have this same problem and I have checked settings and reloaded app what else can I do? It is a real problem it happens every time I hangup every time.