I just tried to use the 5GHz mode (Wide Channel) on my AEBS and i have to be in the same room to enjoy it. If i move 20 - 30 feet away, things start getting ugly and the signal fluctuates between 1 and 3 bars. Mostly settling at one bar....sometimes even cutting off completely!! with the the MBP failing to see the network after that and i therefore have to reset the router. Upside is when it works i get 300mb/s link speeds. However if i stay in 2.4 GHz the signal is consistent even if i move 60 feet away. This however is limited to 144mb/s Do i have a defective router?