Da`Hitch

hey, I have a bit of a problem playing MP3s on my PDA.
It's a Compaq iPaq3870 running WindowsCE 2002 fpr pocketPC, using Windows Media Player 8 for Pocket PC.

now, I took a new SD-memory card, formatted it on the PDA and put some MP3s on it. but when playing the music, it sometimes just stops playing and skips to the next song.
the annoying thing is, sometimes it happens, and sometimes it just doesn't.
Needless to say this is really weird and highly annoying.

Does someone have an answer for this problem of know of another (free) program that'll play MP3s on a PDA?

help would be greatly appreciated.