I had the same problem, and i should reboot the system to get wireless to work.
But now every time wireless stops working, I just enter these commands:
$ sudo rmmod iwlagn
$ sudo rmmod iwlcore
$ sudo modprobe iwlcore
$ sudo modprobe iwlagn

and it gets back to work.
I hope it work for you too.

-- 
wireless stops working until reboot
https://bugs.launchpad.net/bugs/132042
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