named: error sending response: not enough free resources

[Wojciech Puchar]

>>
>> possible reasons
>> - your firewall rules are the cause - check it.
>> - your network card produce problems (REALLY i have that case)
>> - the network/LAN named tries to sent UDP packet is somehow flooded.
>  - the network card changes from UP to DOWN state at the time of the error
>
> See that a lot running local resolver on a wireless-g card and turning on the
> microwave.
this is extreme case. but card don't need to turn UP and DOWN for long 
enough for system to get a message. my second case
>> - your network card produce problems (REALLY i have that case)

is an example. i had such card that just reported error every some amount 
of packets.