About a week ago I got a DrayTek Vigor 2910VG router. The thing's a dream in terms of features (VoIP, Dual WAN, USB port, etc.), but WLAN has been a complete headache. After a fresh restart of my iMac (see my sig for the computers on my home network, all of which are affected by this problem), I can usually connect to the WPA/WPA2-encrypted WLAN. Then, for reasons I can't determine, I will lose all access to the Internet and to other computers on the local network. Yet during these dropouts I am still connected to the WLAN. Pinging the router at 192.168.1.1 is sometimes possible, though the response times vary from 1ms to 100+ms and I'm rarely able to access the router's config page. Another curious thing is that the AirPort signal level in the menubar appears to drop to, say, one or two bars, but it will fluctuate. Reconnecting to the WLAN by turning AirPort off and on again does not work. Going to sleep and then reconnecting to the WLAN on wake does not work. I have to do a full restart of my computer, whether it's my iMac or my wife's MBP. Though that method doesn't always work either -- sometimes it takes two restarts. The network can stay up all night with torrents running, or it can drop out in as few as five minutes after a restart. As I was typing this, I got hit with another dropout. The only apps running are Safari, Mail, and Vienna, and mine was the only computer connected to the WLAN. I also freshly restarted my iMac and the router about ten minutes ago. In hunting around for causes, I find a lot of messages like these in my Console logs: Client application bug: DNSServiceResolve(XXXXX._udp.local.) active for over two minutes. This places considerable burden on the network. Client application bug: DNSServiceResolve(iMac._afpovertcp._tcp.local.) active for over two minutes. This places considerable burden on the network. ... but none of them appear directly before the dropouts. What I have done so far: - Deleted all other previous AirPort entries in Sys Prefs > AirPort > Advanced - Turned off IPv6 - Run Onyx (to remove caches, etc.) - Created a new Network location with just an AirPort connection - Upgraded the router firmware to the latest version (3.1.3) and reset it to factory settings multiple times - Entered OpenDNS settings into my router (and later deleted them) - Read this thread (Apple discussions) and this thread (MR) to no avail Another odd thing is that sometimes just going to the Network field in Sys Prefs can cause the connection to drop. I thought it was just a fluke, but it's happened more than once. I've had D-Link DI-524 and Speedport W 701V routers in the past year, but I never had this kind of connectivity problem. Has anyone experienced anything like this? Can anyone help or offer any troubleshooting advice? Is it Leopard? My router? My wife and I both work from home, and with such flaky Wi-Fi connectivity, we're spending more time troubleshooting and restarting than working.