I face a similar problem with Ubuntu 09.10 then 10.04LTS then 10.04-1LTS.
I'm running an Atheros 5001 chip with ath5k driver.
I changed "network-manager" to "wicd" with some improvement, reverted to
"network-manager" and added "wifi radar" then removed the last. Things
deteriorated with the last kernel update a few days ago with 2.6.32-26 and I
reverted to 2.6.32-25, which was far better on my computer.
I eventually found the folowing bug thread :
https://bugs.launchpad.net/ubuntu/lucid/+source/network-manager/+bug/373680
According to the procedure proposed there I replaced my "network-manager
0.8-0ubuntu3" packet by "0.8-0ubuntu3+volanin1"
(see Question #135241) and my wifi connexion is very steady now, not perfect
(ping test will show a loss of nearly 10%) but much better. The remaining lack
of performance is shown by the ping test but while surfing on the net I don't
face anymore visible disconnections.
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Wireless (WPA) connection is not stable
https://bugs.launchpad.net/bugs/363738
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