I have an Ipad Air and am running iOS 9.2 and spotify 184.108.40.2066
I listen a lot with headphones and my ipad screen locked. There are certain ads for spotify that will pause as soon as they start (usually 15 second ads). all I have to do for them to play is to turn my screen on. the ad isn't a video either that you might expect would require the screen to be on in order to play.
it's a minor problem, as the current go-around is simple, but it requires me to pause what I'm doing in order to keep spotify playing.
i thought it was a strange problem and I couldn't find any other posts about it.