Have a wireless network a 2 xboxs. Have a Newer model xbox with built in wifi downstairs that had a great connection and no lag during games. The xbox Im having issues with is my sons. His is the older model white one and has a adapter. The network settings say hes full strength but the same games lag really bad in multiplayer. His is the room next to my office so its only like 10 feet from the router. The one that works great is downstairs and about 40 feet form router. Any suggestions?