named[69750]: client *ip removed*#37095: error sending response: not enough free resources problem

[rgrenar at seznam.cz]

Hello

My problem with bind:

1) in var/log/messages : named[69750]: client *ip removed*#37095: error sending response: not enough free resources
2) network cards(intel), cables, switch(cisco) changed without positive result
3) system is FreeBSD 9.0, ipfw,gateway,natd,inetd enabled
4) DNS is only forwarded
5) i found this problem in lots of discussion from bsd ver. 4.0 but with no solutions

Thank you
Ruda