I am hoping someone can help me out with this. After several months of trying to figure out what was causing the issue I have finally been able to figure it out and reproduce it. This problem is that after each and every update from Apple on my 2012 iMac, it breaks my wifi for every other device (macbook pro, iphone 5, ipad 3, ps3, dvd, etc). The network still shows, but no device can connect to it. The only one that will remain connected is the iMac (no ethernet cables used). In order to fix it I have to press and hold the reset button on the modem/router. Going into the router/modem and resetting the wifi, modules, router, etc does not fix the problem. Once I hold the reset button down and reboot the modem/router all is fine until I do any other update from Apple (or the Apps Store). Has anyone else encountered this or know of a fix (or even somethign to test)? Both the macbook pro and the imac are running Mountain Lion, all other devices are up to date as well. This is beyond frustrating!
iMac (21.5-inch Mid 2011), OS X Mountain Lion (10.8.2), MacBook Pro, Mountain Lion