war games connectivity issues

was wondering if someone can help me. Every time I try to enter matchmaking I get booted at the last moment and the search restarts. I was on the support line with xbox where they ran me through multiple tests and finally told me to post on the waypoint forum. The download “war games” is on my hard drive but the odd part is the download is not in my xbox live downloaded history. This is where the xbox live support agent told me to post on the waypoint forum. The only game i have issues with playing is Halo. I can connect live with apps and other games. I was wondering if there is a way to download “war games” again. Anyone have suggestions?