Airport Network goes down when copying large files to USB network drive

My apologies if this has been covered before. This is my first post and I am new to the forums.
For several months my wife and I have been using the Airport Extreme 802.11n (Gigabit Ethernet). I use Windows and she uses Leopard. We recently purchased a Western Digital MFL Pro (500GB). If the external drive is connected directly to my PC via USB I can copy to it without any problem. If the external drive is connected to the Airport via USB then if you copy files (generally) over 2GB it takes the whole network down. At that point we have to unplug the Airport wait a few seconds and then plug it back in. It's frustrating because the drive works when connected directly, but not when it's connected to the Airport.
Also, I am hardwired to the Airport (Ethernet) so it is not a wifi issue. Our firmware version is 7.2.1 which is the latest, plus I also updated the software that runs under Windows (5.3.1).
Does anyone know what is happening here? Is this a known issue? Is there a work around or fix available?

I've also experienced this problem with my AEBS and an Iomega 500GB MiniMax drive. My Iomega Drive was formatted for HFS+ from the beginning and I've had no problems accessing it from both my Mac and my Windows PC.
I've been monitoring these groups for signs of a solution, I've talked to the geniuses at one of the Apple Stores near me and so far there's no sign of a resolution. I've sent in feedback to Apple but had no response to it so far (don't know if that's usual).
The only suggestion that has been put forward so far is to take my AEBS, Iomega Hard drive and laptop to an Apple Store and demonstrate the problems there in the hope that a solution can be reached.
I've since purchased a 500GB Time Capsule but haven't had a chance to do the same test on that yet, but as far as Time Machine backups go its worked flawlessly so far (touch wood).
Regards,
Jason
Message was edited by: jbroomfi

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