Really? Hmm...maybe I should rip it from my CD again and try it with a .wma file...
I'll get back and let everyone know whether that worked or not.

Thanks Emrys.
EDIT: Nope. *sigh* It did the same thing. Played the audio file fine the first time or so, then cut out the audio a little way into the song after a couple of plays.
~Anna.