What is wrong with my xBox and/or Router?

A few months ago the household bought another xBox 360, making the count up to 2 now. I noticed, in the next few months, when both xBoxes were online and connected, the newer one couldn't connect to a party, no matter if the other one was in one or not.
The problem consisted with games too. When both were trying to play Grand Theft Auto Online, one or both couldn't connect to a server due to an "Unknown Error". This has become a nuisance. The thing is, the only way both can be in an xBox Live Party if both
are online is when the older when hosts it. I don't know why, but it seems like with 2 xBoxes online, the router allows less to be done. I remember, from a few weeks ago, that after taking a connection test, our router had what I think is some sort of "NAT
error", if that helps. The router is through AT&T, if that may help. If anyone has had this problem, or a solution, or both, let me know. I can't be the only one this.

*BY THE WAY* Sometimes, even if only 1 is online, GTA Online will still kick me out due to the same "Unknown Network Error". Same thing with the parties, won't allow entry even if 1 is online. I'm am furious with it now. I can't really game anymore. It is probably
due to that NAT Error. Thanks

:)

 

What is wrong with my xbox

try restarting your router and modem sounds like its a bit laggy

 

What is wrong with my xbox

Hi,

Did you follow the tips from this guide?
http://support.xbox.com/xbox-live/troubleshoot/connection-issues/performance

When you do the connection test do you get full bars?

When you search for your wireless connection, does your console pick up other wireless networks too? If it does, have you tried changing your wireless channel?