Does the King of Red Lions say anything to you? Because you might be out of boundaries. In the beginning of the game you are given a pretty linear area to explore. If not it may be a defective disc/ system. Try cleaning it or storing your Gamecube/Wii in a less dusty environment.
Hope that helps.
Its happen to me several times while sailing, so I figured there was several scratches on it.
I don't know about it, but, it could be a cyclone. Probably not that.It happened to me when I first bought it, so I didn't think it was that.
Now that I think back on it, it would happen when an enemy was following for an unusual amount of time. Maybe the game was just refreshing itself?
But then again, it would happen randomly too.