I havn't noticed this before, but just did now. Go into your music tab, turn on a song, and change it to about the middle of the playlist, where you can switch songs in both directions.
Play the song, switch to another tab, switch tabs back to music, and quickly press down twice on the volume rocker. The volume thing comes up for a split second, closes, and the song switches to the next in the playlist
Is this just me?
On juicy 4.4