Music files disappearing

1. Music files keep on disappearing on some devices: So I was minding my own business playing the game like always. And at that moment I also realized that there's no music playing on the game so I checked my file manager if the music files is already downloaded, it turns out it didn't. So I download it on the marketstore, and when I'm done downloading I can hear it now. And this the weird part, when I quit the game after done playing, for some reason I can't hear the music again, so I repeat it again by checking and download the music again, and start play testing for a few minutes, guess what?. When I quit the game again the music files are gone again, even though the folder still exist.