Check the setting in your modem/router called GROUP KEY UPDATE INTERVAL. It generally defaults to 3600 secs (1 hour). Found this page. http://forums.whirlpool.net.au/archive/1089217 Set my key to 0 and now been stable for over 6 hours.
27" and 21.5",
Mac OS X (10.6.6),
Dell Netbook, Medion Laptop, no-name PC.
Solution worked for both of my routers (D-Link & Linksys-Cisco) with the 2 iMacs and Dell NetBook. Other 2 PCs unaffected either way. Both routers defaulted to 3600 secs. Now set to 0 secs update. I did call the topic "possible solution", not "the solution". I'm now also able to copy files across my network which I was finding difficult pre this fix. Still not entirely convinced that I have "the solution" to my wifi issue but I've got that warm fuzzy feeling.
Go to WIRELESS tab. Select Basic Wireless and set to Manual, then Wireless Security, set Security Mode to WPA2 personal and you"l see GROUP KEY RENEWAL that has 3600 secs set. Set that to 0. Since doing that, my wireless has now been stable for 31 hours.
D-LINK DSL-2730B.
Option for GROUP KEY RENEWAL also comes when selecting security type. For me it was WPA2 again.
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Possible WiFi dropout solution
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