I have an Airport network whose speed and connection reliability has been gradually deteriorating over the past few weeks, to the point where computers on the network can only rarely and briefly connect. Airport signal strength is full bars on all computers. When I run the connectivity diagnostics, it tells me "You appear to have an Internet connection. Please make sure you typed the web site address properly," or something to that effect. My setup is this: We have Verizon FiOS TV and Internet, and because the TV converter box requires use of Verizon's wireless cable modem/router (I don't know the brand), we have to to use it. I have an older 802.11b/g "flying saucer" Airport Extreme Base Station (which I'd had prior to getting Verizon FiOS) directly connected to it via an Ethernet cable and have configured it as a bridge. Because the signal strength isn't enough to cover the entire house, and so I can use Airtunes, I also have an Airport Express. For the first few months, this setup worked splendidly. My wife and stepson each have a Mac Mini on the network, and my wife and I have also used our work Windows laptops on the network. I have a MacBook Pro that I've used. The deterioration in speed and connectivity has affected all computers equally. When I connect my MBP directly to the Extreme via an Ethernet cable, it's blazingly fast. When I disconnect the cable and switch to Airport, I have the problems mentioned above. When I switch to the Verizon modem/router (which is on a different network), either with an Ethernet cable or via Airport wireless, it works fine. The other computers (except for the faraway one) can use the Verizon modem/router wireless network. So the problem is confined to the wireless portion of the Extreme/Express network. The only obvious thing that has changed over the past couple months is an increase in the number of wireless networks in the neighborhood that show up in Airport -- from 2 to 5. But if interference were the culprit, I'd think it would affect the Verizon modem/router, too. I tried enabling Internet Robustness, and it seemed to work for a couple of days, but it could been part of the sporadic nature of the problem. Does anyone have any ideas? I'm suspecting a problem with the Extreme, which is a couple years old -- but the diagnostics indicate that it's fine.