I'm seeing the same thing with both frequencies, even in the same room as the router. There is something fishy about it. The connection rate never seems to change, and the connection quality doesn't seem to change for me, stays around the same percentage as you are mentioning. Seems like it isn't functioning properly. When I use Xirrus Wifi inspector, it shows the connection at 78 percent with the laptop being about 30 feet away in a seperate room than the router.