Same problem. Played game, left game using save and quit option. Lost probably 75% of our progress and treated me, second player, as if I had never existed in the world at all. Now, in addition, everytime we load any game, seconds after an additional player enters the world (as opposed to just one) the first thing it does it notify us it's been disconnected from Xbox live, which the Xbox home screen and my LAN connection both say is a lie.
Same problem. Played game, left game using save and quit option. Lost probably 75% of our progress and treated me, second player, as if I had never existed in the world at all. Now, in addition, everytime we load any game, seconds after an additional player enters the world (as opposed to just one) the first thing it does it notify us it's been disconnected from Xbox live, which the Xbox home screen and my LAN connection both say is a lie.