I've had the same problem since the day TTK came out. I've been hoping for an a fix or an answer for a year. You won't get one, not from Bungie at least. Closest I got was some "old hat" droning on about floods in various parts of the country or a car hitting a phone pole somewhere else and how these little events can cause these problems for people. What he never answered was why it would those problems would take so long to fix, why they would affect so many people despite them being in the same city as others that can play just fine, or why it would happen the day an expansion came out. Long story short, you won't get a good answer. We're a minority and Bungie already has our money, so they don't care. They expect the community to fix their own problems, that's why you don't see any type of support tickets or a customer service hotline.