I noticed within the last couple of hours that my 2011 13" air won't join wireless networks automatically at start anymore. If I click the AirPort icon and select the network it joins instantly. Here's what I've tried: 1) Rebooting the computer. 2) Removing the networks from network preferences. 3) Removing the entries from the keychain 4) Restarting the router. 5) Resetting the router to defaults and redoing the configuration. Any ideas? I have an airport extreme router. I know it's not the end of the world; but it's kind of annoying. Especially since it's worked for over a month.