So I am attempting to do missions and some of them require that another player gets in the car with you and you drive them to a place during single player mode. Recently players have not been getting in my car. During the sawmill mission, I beat it three times and after the last time I finally was frustrated enough to walk Lamar 5 miles in the game. I haven't seen anyone else having issues with this. Could this be due to using the a bad disk 1?