Hey, nice video, I recently got my W700 in the mail as well and am experiencing the same WiFi issue. What sort of router are you using. On some networks, like the one at my university I don't have a problem but I have the problem at home with a netgear wnr2000 and experienced it this week at a hotel's network.
So far, phone support has been hopeless offering nothing but basic troubleshooting. I have tried updating the atheros driver but still the same effect.
Have you had any further luck with your wireless? I'm hoping I can fix it, but if I continue to have the problem I'll probably end up returning the unit as no wifi is a dealbreaker to me since many of the tablet apps are so reliant on a connection! Let me know if you figure anything out and I'll be sure to do the same.
Best,