So my macbook Air, my macbook retina, and my girlfriends macbook pro are all sharing the same problem. The internet will just stop working about once every few hours. The only way to fix the problem is to turn off the wifi on the computer and then turn it on again. It eventually reconnects and works again. I thought maybe it was my airport express but it was doing the same thing at my sisters house and she just has a standard router. This happening to anyone else? I think it might just be a problem with 10.9.