I can't seem to play any online matchmaking games in Halo 4. It lets me join a match, vote for the map, but when it loads (I see the spinning UNSC eagle) it takes me to the Halo 4 start screen. I cannot play campaign either.
Recent issues which may be related:
A couple days ago my profile disappeared from my Xbox and it would not download. I had to download it onto a friend's Xbox and then transfer it over via flash drive. The profile was corrupted, so I deleted it and managed to coerce my Xbox into finally downloading it directly. It doesn't act corrupted anymore and I managed to play one match online before it started failing again (in the same manner described above). I also tried downloading the first disc onto my hard drive (as suggested by several other posts on various forums) and it did nothing.