Hi, I have noticed weird wifi behaviour on my 2011 Air. It began couple of days after clean install from 10.8.2 to 10.8.3, 10 days ago. In my room on a second floor (router is on the first floor) I have always had fast internet. Now 50% of the time connection speed is very poor, although the bar is full. But if I just pick up the air and point it towards the door, the speed increases. On the first floor works like a charm. Also my iphone's web speed is really snappy when I'm in my room. Could it be the Air, something went wrong with clean install, is it 10.8.3, router...?