Wifi under windows 7 boot camp keeps dying

I have been running windows 7 64 bit under Boot Camp for just under a week, and last night have started to have some pretty serious issues with the built in wifi.
Periodically, without any consistent cause, when I am booted into Windows 7, my internet connection begins to degrade.  Not disconnect or anything, just taking on like 60% packet loss or more, pings to both my default gateway (the wifi router) as well as to anything further out on the internet.  My ipad, iphone, macbook pro are all fine and able to use the internet at the same time without issue, its only the imac booted into Windows 7.  I can reboot with no change, still completely unusable (unable to load even a single web page) for Windows 7.  reboot to OSX, no issues.  Its not the router, or the ISP, its JUST when I'm in win7 using wifi. I've changed IPs, used a static DNS, measured wifi, etc.  I was using this setup for almost a week before the issues started, and I'm assuming its something wrong with Windows7.  Fully patched and up to date, both OSX and Win7.
I finally figured out that I can temporarily fix the problem by resetting the driver for the wifi interface under the Network Adaptor troubleshoot wizard in Windows, this buys me between 5 minutes to half an hour before the issue starts up again.  Nothing else I've found will fix the issue even temporarily. 
I finally ran a 50 ft ethernet cable from the imac to the router and this has for now solved the intermittent issue, but its not sustainable this way as I cannot leave the cords like this.  But clearly there seems to be an issue with the wifi driver in windows that boot camp is using.
Can anyone provide some suggestions of what to look for within windows or a way to debug this more directly?  I used the BootCamp assistant to burn a DVD of drivers at install time and I believe they were the most recent versions, but not sure how to check further.  Device manager reports I am using the Atheros AR938x Wireless adaptor, and this is a mid-2011 27" iMac running Lion. 

I'm having the same problem. Wifi loses connection after 5-ish minutes.
Wondering if it's an issue with the 802.11n drivers...? Seems a little more stable on the "g" networks.
This has been happening since the latest OS X update. I have a mid-2010 Macbook Pro 15".

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