IPhone 6S music playback problems?

So I recently got an iPhone 6s ( on iOS 9 ) but when I play music on apple music or spotify the music stops playing if the screen goes to sleep and when I unlock and press play it doesn't start playing again. I have to close app and start cycle again. Can anyone help?

I think the iPhone sixs' processor is too slow to handle playing music while doing other things. In case you need to have a good security app for your smart phone, do try Leo Privacy Guard to make your device totally

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