AR5001X+ connections freeze on heavy transfers

When I do heavy transfers (500+ mb), regardless of the protocol (NFS,
http, scp, etc), after a non-predictable time the transfers usually
freeze. Strangely, however, I can still happily ping the machine and
ssh into it -- only the main transfer seems affected. The only remedy
seems to be to unload/reload ath_pci. (I haven't seen this problem
between any of my non-madwifi machines.)

Currently I'm using madwifi-ng-0.9.4.4133.20100621 and linux kernel
2.6.36, although I've had this problem for a while.

I'm using the default ath_rate_sample. Perhaps I should try the others?
Perhaps I should provide more (rate)stats too :P.

It's probably related to http://madwifi-project.org/ticket/1790


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