No, haven't froze on me yet (knock on wood!). Also, music library was updated once (manually) and it's all good, though I don't have too many songs loaded. Maybe you have an issue with your flash card, something gets corrupted in there? Have you tried copying the same files to another microSD card and trying it again?
Welp, looks like I put too much file on my microsd. Filling the microsd with audio files only looks like keep the thing in shape.