If you haven't already, try with some basic steps, to see where it takes you and we'll go from there.
Turn off the Xbox. Power off your modem and router for a couple of minutes. Power on the modem and wait one minute for it to connect properly. Power on the router and wait another minute.
Turn on the Xbox and navigate to Xbox network settings. Select Additional Settings tab. Select Restore to factory defaults. If wired, press "B" on your controller and select Test
Xbox LIVE Connection. If wireless, reconfigure Xbox wireless settings.
You may also want to clear the Xbox system cache (3 times in a row). Here's how!
Have us know how that goes.
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