I have encountered an issue several times when loading into a multiplayer match where the camera is stuck in a cinimatic mode or under the map and remains there until you leave the match.
I had a friend that experienced this as well. He was new to Halo and really soured his experience. The only way to fix it for him was to completely reset his PC. Hopefully, this can be fixed.
I found a full restart of my PC was the only way to fix the issue. This will be a big issue with the banhammer since you are forced to quit the match, quit to desktop, and restart the PC.