http://www.xboxlivetheguide.co.uk/XBoxLiveTheGuide3.php?title=My%20NAT%20Setting%20is%20Strict/Moderate%20what%20can%20I%20do
try that link it may help i had a similer issue with my router i had to turn off upnp and set up portforwarding but once i did all my issues were fixed so try that id say
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