Hi, I have a AirPort Extreme that distributes a WiFi network. On top of that, I've got 3 AirPort Express that are connected to the Extreme via WDS (actually, in "extend network mode", I think it's the same). The issue I have is that a computer and an iPhone which are at the totally opposite way of the Extreme are still trying to connect to that one instead of the Express that is literally 1 meter away from them... I therefore don't have any connection on this computer most of the time. What can I do to prevent the computer to connect to the Extreme or to tell the computer to always connect to the best WiFi around (since sometimes I'm working in another room or something). Thanks.