My friend and I cant connect to each other in any xbox live features. We both have open NATs and can play together if one of us follows the other into a match. I have dsl and he has cable. this started out a few months ago but we could connect after a few trys. We havent been able to connect in about a month now. We can also individually connect to mutual friends in a party but if it's just us online, no dice. How can we correct this issue?