Matchmaking doesn't let me join and crashes

I don’t know why MCC doesn’t like me anymore, but I keep getting crashes and it won’t let me join matchmaking and some custom games.

Is anyone else having this problem? Since the last update it’s just been horrible. The game just won’t let me play.

I’m using an Xbox one from around the time MCC released, so I’m wondering if it might just be chugging really badly. But I seem to only have this problem on MCC, every other game seems to work just fine.

(Also if there is a different place to make this post, I would appreciate a mod moving it. I’m new to this forum layout and am not sure if I posted properly.)

Disable Halo 3 cosmetics. It helped me with the crashes