Music stops when I exit app?

So I'm using the playtube app (let's you listen to videos from YouTube without data or Wi-Fi) on my iPhone 6 and every time I exit the app the music cuts out. I have an iPhone 5s with the same app and it works just fine.

If I double click the home button and all the apps show up the music will continue to play.
Need help please!

I have this app as well, it is because the people who run the app cut it off after a certain amount of time rather than just updating it. Once you build up too much storage within the app, it begins to glitch (ads pop up randomly where you can only view the top portion, logs out of the app randomly) and most commonly, the app cuts off your music once you leave the app. My best advice to you, if you are really interested in keeping the app, is once you exit the app and youre on the home screen swipe up your control center and press play and it will continue to play.

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