Samsung U-550 music problem

I have some .wmas and mp3s on my 2gig microSD card, but when I try to play some of them the phone skips the first few seconds of the song. Yet when I put the card in my computer, all the songs play fine. Does anybody have any idea what is going on?

The Samsung SCH-U550 has a dull design and poorly designed controls. Also, its call and multimedia performance was disappointing.