ok this is a really annoying thing that keeps happening to me. It has happened 2 times now and no idea how to fix the problem. the most resent time it has happened has been in the last few days.
What has happened is:-
i started playing with someone online, added then as a friend, played to together and went into partys together etc like the norm you do on xbox live. now suddenly i can not join any of his partys unless there are others in it and the same with his games, e.g. COD 3 unless theres someone else hosting the game i cannot join and vice versa. This has happened before, the something happened in the same way, i could join partys and there games but now i cannot .
I herd that the prob could be conflicting nat types, but, if this is so why could i join them to start with ? and why has it happened now? is there a way to fix it as really, whats the point in it if you cannot play with the people you like?
I have preferred both players to see if that would do anything but nothing.
any help would be very nice