Several days ago, I would receive an error when I attempted to download the recent update. Shortly after, it "magically" allowed my Xbox 360 to download the update. Xbox LIVE worked for a while. Then, my Xbox wouldn't connect to Xbox LIVE (it could connect to the internet). I tried a boatload of things. After about 3 hours, it began to work again. Now, the same problem is happening. I am unable to connect to Xbox LIVE yet I still can connect to the internet. I have two other Xbox 360s in my house which both work perfectly. Neither had a similar problem. I use a Wired Connection. I have tried replacing the Ethernet cable, plugging the cable from my Xbox directly into the wall (instead of using the "Linksys EtherFast 10/100 8-Port Workgroup Switch"), restarting my modem, reforwarding my ports, and restoring factory settings. I'm not sure what else I can do. I've been using the same modem since I got my Xbox 360.