Every once in a while my ipod won't sync a certain artist. Is there a limit on how many songs can be under one artist? I have one catagory that I put all the 'top 40' singles and random songs under (50+) and sometimes under that artist on the ipod only one or a few songs will show up HOWEVER the songs are there and I can find them under 'songs' and 'albums' but again they dont show under the 'artist' i designated. Why is this?