GDC has an extended history of sub-par connectivity. Which is kind of ironic when you think about it. The games industry, particularly up here in the SF Bay Area *ought* to have the best d*mn wifi in the country. Every bleeding edge tech company is within easy reach up here.
But every year, for as long as I can remember, the WiFi signal has been crap. The cel signal is bad too, but that, at least, is explainable by things like concrete pilings and steel rebar. WiFi can be/is usually handled by wireless routers within the space, and when the hall is empty you can get signal all day long.
As it fills up though, all those people, those warm saline heavy bodies start to *soak up* the signal. The end result of this is that the hallways end up lined with clusters of WiFi users (yeah, okay, many of us take our work to GDC with us) all who are trying to find a place they can transmit from.