Samsung SGH-D807 / D806

Hi, I just bought a 1gb micro sd card for my Samsung SGH-D807 cell phone. I was wondering what I need to do to get my music mp3s to play on my phone. I make sure sure that my mp3s are at 190kb or less, and that the name is below 18 characters. I put my mp3 files in the music folder that is on my sd card. Then I stick the sd card in my phone, and it recognizes them as mp3s. But when I play them, they only play for a few seconds then stop. Sometimes they play parts of other songs that I had put on the card in the middle of the music track. I've looked all over the internet, and I can't find any definite answers to this problem. Please help! 😢