Won't let me play Halo 4 multiplayer

A few weeks ago, probably around the Halo: ODST drop, every time I tried to play in a Halo 4 lobby immediately lagged me out. I can play all other games fine however. What do I do to fix this?

Could you explain a little bit better? Are you talking about the pre-game lobby or in-game?

As soon as the game loads and the game says “connecting to new host” then takes me back to the game type selection. This is in any Halo 4 game in any game type Halo 4 is in such as Big Team Battle. I can play as long as the map is not Halo 4

> 2535428610650002;2:
> Could you explain a little bit better? Are you talking about the pre-game lobby or in-game?

As soon as the game loads and the game says “connecting to new host” then takes me back to the game type selection. This is in any Halo 4 game in any game type Halo 4 is in such as Big Team Battle. I can play as long as the map is not Halo 4