Late 2012 Mac Mini loses WiFi connection 2-3 times a week. Problem has been happening over the couple of months. When I try to re-connect I am sometimes asked for the WPA pass phrase. I am up to date using 10.8.3. I'm using a USB keyboard and the Magic Mouse. No other computer has this problem. I opened network connections and I deleted the WiFi connection. Then I went into advanced and deleted preferred networks. I then added them back in but the problem still persists. Any ideas on a fix?