If you have not changed the jamba channel, try doing that. The default one can be pretty populated on some servers, I still join it on my main, though not with jamba, just to see all the other boxers on the server come and go. I cannot imagine that some of the random disconnects people have aren't associated with large data throttle issues.

The in game social panel->chat->jambateamonline channel shows the members of the channel if your not aware.