Support Music stops playing when screen locks

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http://androidforums.com – If I am listening to music stored on my phone, when one track ends I have to push a button on the phone to make it play the next track but ONLY when the screen locks. I was using Go locker and switched back to the stock one with no improvement. Rooted stock rom but had the problem before I rooted it. Using Play Music app that came with the phone. Any thoughts? (General)