I live with this issue 2 year. Problem reproduced with two identical TL-WN722N external USB adapter.
Network connection lost at random time or mostly 100% if re-attach adapter from USB port. Machine reboot help. These attempts didn't help: $ sudo service wicd restart $ sudo pkill wpa_supplicant wicd try to establish connection without success in loop. If I try to set link manually it success: $ iwlist wlan0 scan | grep ESSID $ /usr/bin/wpa_passphrase $SSID $PASS >~/tmp/wpa.pass $ ip link set wlan0 up $ sudo wpa_supplicant -d -Dwext -i wlan0 -c ~/tmp/wpa.pass & $ sudo pump -i wlan0 -h desktop & After all I decide to switch to another network manager: $ sudo apt-get install connman $ connmanctl connmanctl> connmanctl> scan wifi Scan completed for wifi connmanctl> services $SSID wifi_f8d111090ed6_6d617269636f6e5f64655f6d6965726461_managed_psk connmanctl> agent on Agent registered connmanctl> connect wifi_f8d111090ed6_6d617269636f6e5f64655f6d6965726461_managed_psk Agent RequestInput wifi_f8d111090ed6_6d617269636f6e5f64655f6d6965726461_managed_psk Passphrase = [ Type=psk, Requirement=mandatory, Alternates=[ WPS ] ] WPS = [ Type=wpspin, Requirement=alternate ] Passphrase? $PASS Connected wifi_f8d111090ed6_6d617269636f6e5f64655f6d6965726461_managed_psk connmanctl> quit With `wicd` adapted re-attaching cause error, with `connman` this is no longer an issue. `wicd` become broken near kernel v3.2 update. For now I have different versions for firmware-atheros/linux-image/wicd. -- Best regards!
