Help! stopped working ath0

Hi ALL!

Asus n10j
some time (5-6 months) stopped working wi-fi.

Сonstantly repeated (1-2 sec.):
wlan0: link state changed to DOWN
wlan0: link state changed to UP
wlan0: link state changed to DOWN
wlan0: link state changed to UP


ifconfig:

ath0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 2290
        ether 00:22:43:2b:ff:90
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: IEEE 802.11 Wireless Ethernet autoselect mode 11g
        status: associated

wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:22:43:2b:ff:90
        inet 0.0.0.0 netmask 0xff000000 broadcast 255.255.255.255
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: IEEE 802.11 Wireless Ethernet DS/1Mbps mode 11g
        status: associated
        ssid ssid-name channel 7 (2442 MHz 11g) bssid 00:17:9a:74:11:54
        regdomain 96 indoor ecm authmode WPA2/802.11i privacy MIXED
        deftxkey 2 AES-CCM 2:128-bit txpower 20 bmiss 7 scanvalid 60 bgscan
        bgscanintvl 300 bgscanidle 250 roam:rssi 7 roam:rate 5 protmode CTS
        wme burst



FreeBSD netbook.super 9.0-CURRENT FreeBSD 9.0-CURRENT #37: Sat Jul 16
05:17:55 KRAST 2011     alex_at_netbook.super:/usr/obj/usr/src/sys/GENERIC
i386

dmesg:
ath0: <Atheros 5424/2424> mem 0xfdff0000-0xfdffffff irq 17 at device 0.0 on
pci2
ath0: AR2425 mac 14.2 RF5424 phy 7.0

pciconf:
ath0_at_pci0:2:0:0:        class=0x020000 card=0x10261a3b chip=0x001c168c
rev=0x01 hdr=0x00
    vendor     = 'Atheros Communications Inc.'
    device     = 'AR5006 family 802.11abg Wireless NIC'
    class      = network
    subclass   = ethernet
    bar   [10] = type Memory, range 64, base 0xfdff0000, size 65536, enabled
    cap 01[40] = powerspec 2  supports D0 D3  current D0
    cap 05[50] = MSI supports 1 message
    cap 10[60] = PCI-Express 1 legacy endpoint max data 128(128) link x1(x1)
    cap 11[90] = MSI-X supports 1 message in map 0x10
ecap 0001[100] = AER 1 0 fatal 1 non-fatal 0 corrected
ecap 0002[140] = VC 1 max VC0


-- 
----------------------
Alex V. Petrov