I am getting same issue with AR9285 Wireless controler. Since unity cant use 
wicd as network manager I using command line tools to stay connected to wifi. 
You need to stop network-manager service:
sudo service network-manager stop
Then you need to create simple wpasupplicant config file with this command:
wpa_passphrase "name of your network" "your wpa passkey" > wpa_supplicant.conf
sudo mv wpa_supplicant.conf /etc/wpa_supplicant.conf
Now you can start your connection with command:
sudo wpa_supplicant -B -Dwext -iwlan0 -c /etc/wpa_supplicant.conf
After establishing the connection you need to grub network card settings from 
dhcp server or set it manualy. If you use dhcp you can do it with this command:
sudo dhcpcd wlan0
That is it. Now you can access internet.

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https://bugs.launchpad.net/bugs/786603

Title:
  network-manager : wifi always disconnecting

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