This has been happening to me as well. The music keeps playing even if I try to hit pause. Swiping the app to close it does nothing, nor does trying to "Close All Apps". They all close but the music keeps playing. Strangely if I re-open the app it shows a different song queued up with the play button present, even thought the music is playing. It's as if the app doesn't even know it's on. This identical thing also happens when I play Amazon Music so it seems like it's a problem with the update or operating system itself.
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