What can make the IOS Music app pause when the pause icon is not visible?
I was using an iPad app that has no sound and the song I was playing stopped. No fingers (nor anything else) was near any of the buttons. Brought Music to the foreground, and it was definitely paused.
Notification sounds (alarms, e-mail, timers, etc.) can interrupt Music, but they only reduce the volume, and not permanently. Also, none of those happened.