I'm trying to use my new phone (LG Revel 4)to listen to an audio book. After earphones plugged in and audio started, I turn off the screen to prevent hardware buttons from being engaged, playback stops when I move or rotate the phone. When I touch the play arrow to begin playback again, sound comes thru phone speakers instead of earbuds. Unplug earbuds and plug in again. Repeat process.
Found the answer: Earbud jack had to be more forcefully plugged in.