problems on large file transferring

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I have some problems transerring large file on mi wifi link

I get this error

Sep 21 00:35:06 skull-one kernel: NETDEV WATCHDOG: wlan0: transmit timed out
Sep 21 00:37:50 skull-one kernel: NETDEV WATCHDOG: wlan0: transmit timed out
Sep 21 00:38:30 skull-one kernel: NETDEV WATCHDOG: wlan0: transmit timed out
Sep 21 00:39:16 skull-one kernel: NETDEV WATCHDOG: wlan0: transmit timed out
Sep 21 00:42:25 skull-one kernel: NETDEV WATCHDOG: wlan0: transmit timed out
Sep 21 00:50:37 skull-one kernel: NETDEV WATCHDOG: wlan0: transmit timed out
Sep 21 01:06:23 skull-one -- MARK --
Sep 21 01:26:24 skull-one -- MARK --
Sep 21 01:46:24 skull-one -- MARK --
Sep 21 02:06:24 skull-one -- MARK --
Sep 21 02:26:24 skull-one -- MARK --
Sep 21 02:46:24 skull-one -- MARK --
Sep 21 03:06:24 skull-one -- MARK --
Sep 21 03:26:24 skull-one -- MARK --
Sep 21 03:46:24 skull-one -- MARK --
Sep 21 04:06:24 skull-one -- MARK --
Sep 21 04:26:24 skull-one -- MARK --

I'm using hostap 0.0.4 un 2.4.22 kernel slackware 9.1

Thi is mi hostap configuration file

ifconfig eth0 0.0.0.0
ifconfig wlan0 0.0.0.0
iwconfig wlan0 essid granduca_six
iwconfig wlano rate auto
iwconfig wlan0 channel 3
iwconfig wlan0 mode master
iwconfig wlan0 key XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XX
brctl addbr br0
brctl addif br0 wlan0
brctl addif br0 eth0

ifconfig br0 192.168.0.1 netmask 255.255.255.0 up

iwpriv wlan0 maccmd 1
iwpriv wlan0 addmac 00:30:BD:62:AD:79
iwpriv wlan0 addmac 00:80:C8:B2:E0:21
iwpriv wlan0 addmac 00:09:5B:67:59:79

I use a netgear ma311 on both side of the wifi link
I use a home made cantenna

http://is0grb.ods.org/wifi/articoli/andrea_raviola/index.htm
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