Like many people I cannot get into games in matchmaking, but I have noticed something additional.
After searching for a game in matchmaking, and backing out I cannot access xbox live on other titles that aren’t having a problem.
For example, if searching is taking too long. I hit b to back out of matchmaking. Then I quit halo and launch advance warfare, the game will not be able to connect to live unless I restart my xbox. If I don’t restart the game will keep trying to connect with no avail just like halo is.
So maybe the problem is a greater one where halo doesn’t interface with the xbox live services properly? It would make since given additional bugs like Xbox live thinking a friend is in my game when halo disagrees.