Hey there, if you're unable to gain XP after a match there are three possible reasons. The first is that you've reached the daily XP limit and you'll be able to gain more when the challenges reset (2AM PST). The second is that you may have reached the max
rank of 130, if that's the case you cannot gain anymore XP because there are no more ranks to be earned and you won't even see the XP screen after a game. The final explanation is that you have recieved an XP ban for one of many reasons, one of the more common
ones is idling in games. Check out
forums.halowaypoint.com/yaf_topics12_Halo-4.aspx for more info on bans.
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