I tired something similar last night. I re-enabled 'N' on my WiFi AP, so it was configured for N & G. The N800 went blind. I walked out to the street, about 30 ft from the AP, and the N800 started to see the local neighborhood AP's, and my own 'N' AP. I connected to my N AP without a problem and walked back into the house next to the AP. The N800 maintained a connection. When I tried to reconnect to the N AP while in the house, the N800 went blind again. Walking back out to at least 30ft from the AP allowed the N800 to connect to the N AP. So if I stay far enough away from the N AP, it works. When I get close, if is already connected, it stays connected, but it can't reconnect. Of course when I switched the AP back to G-only mode, the N800 could connect no matter where I was. So maybe there is something nearby that prevents the N800 from seeing WiFi. If not an N access point, perhaps something else that generates enough 2.4 ghz noise to muck up the N800.