just to be clear on how to reproduce having the game reset after going to the UNSC loading screen. Load a infinity slayer custom game on either Complex, Impact, Ravine or Meltdown and they fail to load and cause the game to reset. If you play these maps on War Games that's why you are disconnecting from the the game. One really weird workaround to this that I've had some success with is launching Halo 4 throughout Waypoint and then immediately loading a custom game of Complex, it will sometimes load and I was able to play on Meltdown in in the Dominion playlist by doing it this way.