The issue to the disconnections today may be due to the Xbox Live Status currently. Microsoft are currently working on the [b]Purchasing and Content Usage[/b] topic. Go to [b]xbox.com/status[/b] for more info and updates on the bug.
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After the DDoS attacks they went into the XBL and PSN Store and changed the price of some of the most popular games to $0.00. Had to be taken offline to fix everything.