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Clear your mac address. This is the key to connect your xbox to xbox lives servers. Go to your network settings, click advanced, go to alternate mac address, and hit clear. Your xbox will restart.
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Restart the game if you get stuck in loading a game.
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Restart your search if you get the problem with a dedicated server error while searthing for a game. If it persists, visit step 1.
These problems are mostly on Microsofts server side…so resetting your modem won’t do much. To determine this, try a different game and see if it works on live.
Only issues I haven’t been able to fix are the teammates in a fire team being dropped. I’m not saying these will work, but they have for me. Worth a try for any players struggling out there.