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Is your Spotify a 'free' or 'paid-up' subscription?
I had more-or-less the same issues when using the 'free' service. Since upgrading, my Spotify BT streaming has been flawless. I have no problems with the sound quality compared to other sources probably except with HD Radio.
By the way, I also have the iphone 5s but use the Viseeo BT adapter in my '08!
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2015 K46 S1KRR 
2008 E90 M3  |