Hey there I think I know the problem this worked for me I hope it works for you.
Open terminal and paste this code
sudo iwconfig wlan0 txpower 8B26
because by default the txpower is excessive for the ath driver which causes it 
to actually perform worse I'm not even kidding! Hope it works, let me know the 
results

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https://bugs.launchpad.net/bugs/947697

Title:
  Atheros AR9285 Wireless on Ubuntu 12.04 is slow, unstable and has a
  weak signal.

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