Jack: you can at least try out the 3.9rc3 kernel from
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.9-rc3-raring/ (you need
to install both linux-image and linux-image-extra before rebooting) and
report back.

That said, even though a lot of commits have been put there recently
[1], there are some more commits in 'linux-next' (what will become 3.10
eventually, unless some of the commits are backported to 3.9 and earlier
kernels) [2]. Most interestingly, [2] has "Update initvals for AR9462"
and "Fix fixed antenna for AR9462". It's somewhat harder to test as
there are no pre-build kernels, but it is possible via drivers-compat
backports [3] [4] - latest 2013-03-15 package again misses a couple of
commits though, including a commit that says "... Running it on those
queues anyway can introduce some race conditions leading to unnecessary
chip resets.".

[1] 
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/drivers/net/wireless/ath/ath9k?id=HEAD
[2] 
http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/log/drivers/net/wireless/ath/ath9k?id=HEAD
[3] https://backports.wiki.kernel.org/index.php/Documentation/compat-drivers
[4] https://www.kernel.org/pub/linux/kernel/projects/backports/2013/

(I've personal interest in AR9485 problems on my Zenbook)

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https://bugs.launchpad.net/bugs/945379

Title:
  168c:002b Wireless connection randomly drops -- ath9k

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