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[GreyGeek <greygeek77@xxxxxxxxx>]

I've been having this problem with my AR9462 wifi chip for several months.  It randomly disconnects, with the uptime varying between a minute and 10 minutes.  The speed often drops to 1Mb/s and remains there, rendering the connection worthless.
I've tried a variety of kernels from 3.2 to 3.8.
I've tried various combinations of the ath9k params, but no combination seems to help the 0168C, 0034 device.
Dmesg merely reports:
[94720.719145] wlan0: authenticate with 20:aa:4b:3a:85:e3 (try 1)
[94720.721300] wlan0: authenticated
[94720.733950] wlan0: associate with 20:aa:4b:3a:85:e3 (try 1)
[94720.736683] wlan0: RX ReassocResp from 20:aa:4b:3a:85:e3 (capab=0x411 status=0 aid=1)
[94720.736696] wlan0: associated
[94726.045203] cfg80211: Calling CRDA to update world regulatory domain
[94726.051433] cfg80211: World regulatory domain updated:
[94726.051438] cfg80211:     (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
......
[94726.051478] cfg80211: Calling CRDA for country: US
[94726.059167] cfg80211: Regulatory domain changed to country: US
[94726.059173] cfg80211:     (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
...
[94730.104613] wlan0: authenticate with 20:aa:4b:3a:85:e3 (try 1)
[94730.302223] wlan0: authenticate with 20:aa:4b:3a:85:e3 (try 2)
[94730.502096] wlan0: authenticate with 20:aa:4b:3a:85:e3 (try 3)
[94730.702006] wlan0: authentication with 20:aa:4b:3a:85:e3 timed out
[95190.831209] wlan0: authenticate with 20:aa:4b:3a:85:e3 (try 1)
[95190.833185] wlan0: authenticated
[95190.845795] wlan0: associate with 20:aa:4b:3a:85:e3 (try 1)
[95190.849700] wlan0: RX ReassocResp from 20:aa:4b:3a:85:e3 (capab=0x411 status=0 aid=1)
[95190.849705] wlan0: associated
[95359.802393] cfg80211: Calling CRDA to update world regulatory domain
[95359.805724] cfg80211: World regulatory domain updated:
[95359.805727] cfg80211:     (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
...
[95359.805750] cfg80211: Calling CRDA for country: US
[95359.809011] cfg80211: Regulatory domain changed to country: US
[95359.809013] cfg80211:     (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
...
[95391.685123] wlan0: authenticate with 20:aa:4b:3a:85:e3 (try 1)
[95391.687191] wlan0: authenticated
[95391.833768] wlan0: associate with 20:aa:4b:3a:85:e3 (try 1)
[95392.033399] wlan0: associate with 20:aa:4b:3a:85:e3 (try 2)
[95392.233224] wlan0: associate with 20:aa:4b:3a:85:e3 (try 3)
[95392.433109] wlan0: association with 20:aa:4b:3a:85:e3 timed out
[95824.493528] wlan0: authenticate with 20:aa:4b:3a:85:e3 (try 1)
[95824.497611] wlan0: authenticated
[95824.645228] wlan0: associate with 20:aa:4b:3a:85:e3 (try 1)
[95824.841283] wlan0: associate with 20:aa:4b:3a:85:e3 (try 2)
[95825.041185] wlan0: associate with 20:aa:4b:3a:85:e3 (try 3)
[95825.241075] wlan0: association with 20:aa:4b:3a:85:e3 timed out
[95829.302583] wlan0: authenticate with 20:aa:4b:3a:85:e3 (try 1)
[95829.304585] wlan0: authenticated
[95829.317308] wlan0: associate with 20:aa:4b:3a:85:e3 (try 1)
[95829.320003] wlan0: RX ReassocResp from 20:aa:4b:3a:85:e3 (capab=0x411 status=0 aid=1)
[95829.320007] wlan0: associated
[95852.748782] wlan0: deauthenticating from 20:aa:4b:3a:85:e3 by local choice (reason=3)

and then it stops.  I have no idea what "reason=3" means,  since it isn't disconnecting by my choice.
There are no "errors"  or "failures" for this driver listed in the system logs.

I had been running Kubuntu 12.04.3 since it was beta and to avoid the
problem I began using a cat5 connection to my modem because my wireless
connection is worthless.

Last week I switched to KWheezy 1.3 to bypass the Ubuntu repositories and connect directly with Debian's.
The problem persists.

-- 
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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.

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  In Windows 7 the signal is excellent, stable and strong. I use the
  netbook for every home, but in Ubuntu you can only connect a few
  meters away. In my university can not connect because the signal is
  too weak. In Windows 7 is okay. Everyone in my building at the
  university can connect very well with Windows. Who uses computer ath9k
  driver, no.

  Just search on Google to know that everyone who uses Atheros AR9285 have problems, even with computer hardware certified by Canonical:
  http://www.ubuntu.com/certification/catalog/component/pci:002B:168C-NETWORK

  My computer: Asus EeePC 1215B - APU AMD C-50, 2GB RAM.
  Distro: Ubuntu 12.04 Beta 1 - 32-bit (64-bit the problem continues)
  Kernel (uname -a): 3.2.0-18-generic-pae #28-Ubuntu SMP Fri Mar 2 22:11:12 UTC 2012 i686 athlon i386 GNU/Linux
  Driver wireless: ath9k

  Network:
  idescrição: 	Interface sem fio
  produto: 	AR9285 Wireless Network Adapter (PCI-Express)
  fabricante: 	Atheros Communications Inc.
  physical id:
  0
  informações do barramento:
  pci@0000:01:00.0
  nome lógico:
  wlan0
  versão: 	01
  largura: 	64 bits
  clock: 	33MHz
  capabilities: 	pm msi pciexpress bus_master cap_list ethernet physical wireless
  configuração:
  broadcast	=	yes
  driver	=	ath9k
  driverversion	=	3.2.0-18-generic-pae
  firmware	=	N/A
  ip	=	192.168.1.2
  latency	=	0
  link	=	yes
  multicast	=	yes
  wireless	=	IEEE 802.11bgn
  recursos:
  irq	:	16
  memória	:	fea00000-fea0ffff

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