streaming with ath

[zsolty szasz]

Hello people, 

I have ar9227 in hostap mode in my home server. My config is: 

wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
    ether 30:b5:c2:63:51:77
    inet 192.168.2.1 netmask 0xffffff00 broadcast 192.168.2.255 
    nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
    media: IEEE 802.11 Wireless Ethernet autoselect mode 11ng <hostap>
    status: running
    ssid freebsdap channel 1 (2412 MHz 11g ht/40+) bssid 30:b5:c2:63:51:77
    regdomain 32924 country CN indoor ecm authmode WPA2/802.11i
    privacy MIXED deftxkey 3 AES-CCM 2:128-bit AES-CCM 3:128-bit
    txpower 20 scanvalid 60 protmode CTS ampdulimit 64k ampdudensity 8
    shortgi wme burst dtimperiod 1 -dfs
    groups: wlan 
Server is running: 11.0-RELEASE-p8
I setup minidlna in the server. Problem is that my 2 TV-s (1xSamsung and 1xLG) disconnects from wireless after a period of time while wathing movies. But, if I setup the wireless in the server in 11g then I can watch all movies from start to finish without problems. Sometimes the movies are buffering for a couple of seconds but are stable 100% in 11g mode. Sadly not in 11n.

Can you help me? What to check? Zsolt