I had this problem again, but now I was able to solve it.

1. I disabled the wifi at the applet, then 
2. ifconfig showed that it is really off.
3. sudo rmmod iwl4965 iwlwifi_mac80211, and finally
4. sudo modprobe -a iwl4965
5. enabled wireless at nm-applet

after circa 30secs of waiting my computer connected to the network

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iwl4965 can't reconnect if AP is lost and then comes back
https://bugs.launchpad.net/bugs/183474
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