Same problem on ASPIRE 4736Z. Most of the times the connection is fine.
But sometimes (after closing the lid or wifi router is far away) it is
very unpredictable, connecting and disconnecting, re-asking me for
password...

When I reboot it works fine again.


~$ uname --all
Linux luky-laptop 2.6.31-21-generic #59-Ubuntu SMP Wed Mar 24 07:28:56 UTC 2010 
i686 GNU/Linux

~$ lsmod|grep ath
ath9k                 258744  0 
mac80211              181140  1 ath9k
ath                     8060  1 ath9k
cfg80211               93052  3 ath9k,mac80211,ath
led_class               4096  1 ath9k

~$ lspci |grep -i ath
04:00.0 Network controller: Atheros Communications Inc. AR928X Wireless Network 
Adapter (PCI-Express) (rev 01)

-- 
Ath9k: Signal drops to 0% on connection to AP after a few seconds, drops 
connection.
https://bugs.launchpad.net/bugs/379096
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