Why is my iphone 4s music app deleting songs?

Ok, so i just got on a bus to go back to college and i want to listen to my music on my iphone. When i open it and press shuffle, it just keeps rapidly going to the next tracks and then when i check the list of songs they are all being deleted one by one. I'm on ios 7. What the **** is this **** this is really stupid

This Question is great, I also waiting for best answer.

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