Beacon stuck on ath0

[Jok]

Oct 26 20:18:21 right kernel: ath0: stuck beacon; resetting (bmiss count 4)

I got a lot of those messages in dmesg and the only way to reset the
card is to turn off the server and turn it back on, which isn't very
practical since it is my gateway.

FreeBSD right.frequency.dk 7.1-PRERELEASE-p1 FreeBSD 7.1-PRERELEASE-p1
#0: Sun Oct  5 09:53:37 UTC 2008
root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

FreeBSD 7.0 was even worse with a lot of stuck beacon and rx FIFO overrun.

Anything I can do to help debug it?