HP 8510p notebook. Same issue. After several hours of working the wireless 
module dies. Gnome network manager shows the network is still available, but 
"enter the passphrase" dialog appears. After entering passphrase the connection 
process hangs. 
"iwlist scan" says "resource temporary unavailable"
The problem solves (for the next several hours) if I say
rmmod iwl4965
rmmod iwlwifi_mac80211
rmmod cfg80211
modprobe iwl4965

But it's too annoying to repeat the commands every two hours. And you
can't use any program that demands long time internet connection.

-- 
[Gutsy] Intel 4965AGN wireless connection dies
https://bugs.launchpad.net/bugs/149214
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