My 30gb ipod crashes when I try to play certain songs.

It used to play all my music just fine.

One day, randomly, it crashed when I played certain songs. The songs are ones I've edited myself and are not from itunes.

I've held the centre button and menu to get it to reset... no effect. Restored it through itunes several times... nothing has fixed it. The songs don't crash my iPhone.

This is especially disappointing because it is older but I JUST bought it off a friend.