sometimes i hear loud clicking or knocking coming from the harddrive side of the xbox while playing gun v. then the game will freeze. so i turn of the power and turn it back on. the knocking is still there but the game wont load. instead i get "your xbox needs service" so i take the game out and boot it empty and the knocking stops. then i put the game back and its fine untill the next time it happens... any help guys?? thx!