Here's my setup:
TL-WN721N USB adapter. This uses:
goose@vaio:/tmp$ lsmod | grep ath
ath9k_htc 43082 0
ath9k_common 12648 1 ath9k_htc
ath9k_hw 311433 2 ath9k_common,ath9k_htc
ath 17114 3 ath9k_hw,ath9k_common,ath9k_htc
mac80211 171389 1 ath9k_htc
cfg80211 113445 3 mac80211,ath,ath9k_htc
usbcore 104555 7 ehci_hcd,uhci_hcd,btusb,ath9k_htc,uvcvideo,usbhid
My router is BT Home Hub 4 (Type A) | Software version 220.127.116.11.18.104.22.168.17 | Last updated 08/12/13 (the latest firmware)
This is its wireless config:
The problem is that the wireless connection drops frequently with the following coming up when that happens in /var/log/messages
Mar 10 08:54:34 vaio wpa_supplicant: wlan1: WPA: Group rekeying completed with cc:33:bb:12:a7:fc [GTK=TKIP]
I've got an idea what could be causing this but don't want to bias you diagnosticians by mentioning it. Even if i'm right, i'm not sure of a good solution.
What do you think can be done?