There is an issue with the game during co-op and a controller loses connection for any reason. If your controller disconnects for any reason during a Co-op match, the game logs you out back to the main halo splash screen.
Was just playing halo:CE and half way through the mission my controller died, sending me back to the splash screen and causing us to lose all progress. This could be really frustrating if it happened during the last few seconds of a campaign mission.
Also for some reason my co-op partner does not get any scoring, don’t know if this is intentional or just a bug but if you could look into this also.
Thank You