This continues to affect me on 2.6.38-9-generic-pae from -proposed.
Wireless becomes unusable after a few hours.

uname -a:
Linux ceres 2.6.38-9-generic-pae #43-Ubuntu SMP Thu Apr 28 17:12:11 UTC 2011 
i686 i686 i386 GNU/Linux

excerpted lspci:
04:00.0 Network controller: Atheros Communications Inc. AR5008 Wireless Network 
Adapter (rev 01)

>From dmesg:
[58864.888234] ath: Failed to stop TX DMA in 100 msec after killing last frame
[58864.888260] ath: Failed to stop TX DMA!

(repeated every few seconds)

Will provide more data on request.  Have also tried latest stable
compat-wireless but not yet bleeding edge.

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https://bugs.launchpad.net/bugs/736171

Title:
  ath: Failed to stop TX DMA in 100 msec after killing last frame

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