Seems to be a lot of traffic about this on answers.microsoft.com (sorry Mods probably should've read posting etiquette before doing that

)
Found this snippet from a post there:
"The Surface uses a dual-band WiFi adapter. Set the password, maximum data rates, and encryption on both of your router bands to the same values for both the 2.4 GHz and 5 GHz bands to avoid "limited" availability of your WiFi. Once you have done that forget the network and reconnect with the new password".
I'm committed to Windows 8 and the Surface RT...hope this all works out 'cause I want one badly!