I'm having the same problem when the wireless card is under stress (bt 
downloads & anything over 500kb/s)
I'll add up my lspci & dmesg, for more info just ask.
The wireless adapter is a SMC2802W v.1
By the way, I manage to get the card back online by typing:
sudo ifconfig wlan0 down
sudo ifconfig wlan0 up
sudo iwconfig wlan0 essid any
sudo dhclient

** Attachment added: "lspci.txt"
   http://launchpadlibrarian.net/9292497/lspci.txt

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Network interface becomes unstailble and then the machinge 
https://bugs.launchpad.net/bugs/121224
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