I have a SAMSUNG i70,

Question

I have a SAMSUNG i70, which is under a year old and worked brilliantly as a camera. But when i put in a new memory stick for MP3 uses, and loaded music, it worked but then crashes when i change a couple songs. The camera aspect still works fine, and if i use the couple songs on my first memory stick it works.I asked currys (who i bought the card from), and i was made to formatt it then reload the music, but it's still happening. But as i i said it's new, and the other functions work. what could be wrong!?