I just played the lamest 4v1 because Halo blows when it comes to being able to fill in missing players, and somehow I got temporary banned from matchmaking for suffering through it and NOT quitting?? BS, Bungie. Or whoever tf is trying to take credit these days.
As this appears to be an issue with your game, we recommend heading over to https://aka.ms/HaloSupport for further assistance. Please review the latest known issues and submit a ticket if your issue is not listed.
Thanks!