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What I have to guess is that you ended up in a modded lobby. The bad news is that this was always a big problem with the 360 version of COD4 and it's actually gotten worse. You'd probably run into another negative XP bug after a dozen matches again. The WORSE news is that Activision stopped taking requests to fix this as of 2014. The only thing you can ...


Try restarting the console and clear the game storage cache.

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