Yes, I lose the ability to connect to any web server, even though the Airport card says it is working fine.
I have Parallels, but I am using BootCamp most of the time when I want to run XP Pro and I have never been successful with a MacOS emulating the AmigaOS, so I always use WinUAE via AmigaForever, or AmiKit. I think AmiKit is the greatest and support it when ever I can.
I have almost never experienced a disconnection using Windows on the MacBook, but almost always experience several disconnects using MacOS and the only fix is to reset the DSL or Cable modem, or restart the laptop. I have always kept the MacOS up to date and run the updater often, so I don't think that is the problem. It is getting so frustrating that I now find myself booting into Windows much more often than I want.
The only time I want to run Windows is to A. run Amiga emulation, and B. to run my CAD program for working.