SB1+ Sub Cutting Out?

Strangest thing...I signed up for Spotify Premium today, which is I thought supposed to be the most compatible music streaming service for the Omni collection, and when I started playing the songs I downloaded, the sub was cutting in and out. No other streaming services have this problem, and tv sound does not do this. Anyone ever heard of this or know what might be going on here? Doesn't make sense, and very annoying! I have an HTC One Remix (the small one) from which I am playing music. Thanks in advance for any replies.

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