Is AirPort Express known to be a little quirky in its range? Mine is right under my desk, 3 feet away from my new MacBook, and sometimes the radar dips down to just 3 or even 2 bars. Kind of silly, no? I live in an apartment building where there are literally dozens of wireless networks within my range (although my computer only connects to my network, yes I checked). Might this have to do with the interference? Thanks for any comments.