Description of problem:
After fiew minutes of newtork connection the network is compleatly unusable(simple ping -w 2 <hostname> report packates lost of 100%).

Version-Release number of selected component (if applicable):
$lspci|grep -i network
03:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01)

$lsmod|grep ath
ath9k                  91543  0 
mac80211              234523  1 ath9k
ath9k_common            2633  1 ath9k
ath9k_hw              272190  2 ath9k,ath9k_common
ath                    14578  2 ath9k,ath9k_hw
cfg80211              136154  3 ath9k,mac80211,ath


How reproducible:
Problem observed every time.

Steps to Reproduce:
Use Network manager to connect to wireless network(I tryed only wpa enabled).
  
Actual results:
Connection is unusable after fiew minutes.

Expected results:
Normal usable network connection.

Additional info:
The network was quit slow on Fedora 14 as weel, then the updates with kernel 2.6.35.11.83 fix it.

Workaround:
In Fedora 15 - disabling power managment on the card make the problem disappeare.