Audio from other files interrupting main audio
 

I have the BS player for Android V 1.15. on Samsung S2
I have multiple podcasts on an SD card. When I play them every once in a while audio from a different file will interrupt the podcast I am listening to for about 3-7 seconds. It happens completely randomly and there is no transition noises like distortion or anything it just cuts to different audio then back again. Any thoughts?