Song Playback has Format or Coding Issues

So, frequently, but without obvious pattern, some songs simply go silent during playback. One example is an m4p file which generally play normally for about 30 to 40 seconds and then stops making noise. The bar showing the position is the song is still working though, it is movable and seems to show an accurate amount of time passing. A few times I've tried moving the slide to a different position in the song, past the point where it frequently goes silent, and the file plays normally. Also, I'm not entirely sure that this is solely related to m4p files by the way, that's just one that I'm sure does this. I really like the options and capabilities in Songbird and hope that this has some sort of simplistic solution.