Hello,
I run across the same issue on my home network where the router would drop my wireless computer. This would happen when I would use WPA encryption. When I switched to WEP, everything was fine.
I called and talked to 3COM tech support and they suggested that I make sure I have the lastest and greatest firmware and drivers. I have both and WPA still does not work...
I really want to use WPA, but as of now, I am stuck with WEP...