100% Boot from Reach/CE on 360

I’m being booted from 100% of my attempted connections to Reach and CE games on 360. I am not receiving any NAT errors, however I am now on what I would term the “progressive ban” list for quitting too many games in a row. I wanted to quit, literally, none of the games. There is no “missing map” notice or any other notification for why I might be ineligible to participate in the match.

What is going on?

New? symptom - I am achieving 100% map load failure when I would assume that I am the match host.