Just to update I have had the double playback once more since, terminal doesn't seem to throw any errors, but it seems to call the track earlier than the end of the last one. Maybe if this is combined with pressing previous track we get our two streams?

One thing I have also noticed is I have had the odd occasion were qspot is playing with no output. If you leave it playing and quit the application music plays for milliseconds just before the application terminates. Seems to happen more when using the headset.