Wifi lockups on my Airport Extreme seem to be occurring more often lately. Here are the symptoms: When I access the internet I can sometimes download a page before the lockup. Then the wifi icon at the top of my Macbook Air grays out with an exclamation point (!) in the center. If I drop down the wifi status panel I see my network and it is checked indicating that I am connected. Other wireless devices accessing my network have the same problem when this occurs but wired devices (my iMac) still have network and internet access. This tells me that the problem is strictly a wifi issue. The status LED on the Airport shows green. The only way to clear it seems to be to unplug the airport extreme, wait ten seconds, plug it back in and wait until it resets itself. Occasionally it takes multiple resets to get it back. (Usually when my wife does it. Then I not only have a wifi problem but a whining wife as well!) The software version on the Airport is 7.6.3, but this happened on prior versions as well. My Airport is configured to connect to the internet with a PPoE connection to a Westel modem. The security is WPA2 Personal. It provides DHCP and NAT services for the network. DHCP is set to renew leases daily. Radio modes, 2.4 ghz, and 5 ghz channel selections are all automatic. If you've experienced this problem and found a solution I would appreciate your help.