I know that this isn't working for everyone, but I set a static IP for my Xbox within the Xbox network settings and setup that IP as DMZ in my router settings. Did it yesterday and played all night with no issues at all. This is after playing for the last 6 days and getting booted every 5-10 minutes. If this doesn't work, I noticed that if you join a friends Fireteam you can play for longer in between errors (20-30 minutes). Also, it seems to happen less often in Crucible. Good luck man. Bungie has abandoned us.