WDTV Live Stutter Only When Playing Music

I was able to setup my WDTV Live pretty easily. Within minutes, I could get video and photo playback smoothly. However, it always stutters when I try to play music, either from a local drive or shared network folder. It doesn’t matter whether the music files are MP3 or WMA. The most strange thing is that sound tracks in video files play nicely. Anyone knows how to solve it?

Many thanks!

Ben