I had this problem! But I fixed it. Whatever app I'm on, just pin it! Go to your recent app menus and click the pin. To unpin just hold the recent app menu.
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=== Update (08/02/2017) ===
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I fixed the problem by uninstalling music streaming apps like "my mixtapes" its been a week and not one pause! Just try uninstalling apps that can download things like music to your phone and your good!
I had this problem! But I fixed it. Whatever app I'm on, just pin it! Go to your recent app menus and click the pin. To unpin just hold the recent app menu.