do you have the option 'show popup ... only when inactive' ticked?
having a look at how other players do it, if the only when inactive option is ticked then it always shows the notification after resuming from pause, so i will do the same with no extra options. And it should just show the notification if playback is resumed (again respecting the existing flag above) - so i wont add any new options, just enhance the existing behavior
edit:
wrong way around - only when its not ticked!