BIND 9.4.1-P1 freezes randomly on FreeBSD 6.1

[Craig Cocca]

Recently, we've updated our internal nameservers from BIND 9.3.2 to  
9.3.4-P1, and then to BIND 9.4.1-P1.  We're running this on FreeBSD  
6.1 on a P4 2.8 GHz with 1GB of RAM.  We're experiencing a problem  
where named will be running normally, at 10-14% CPU load and right at  
the 515M memory cap that we set for it, and then it will suddenly  
stop doing recursive lookups.  What is interesting here is that the  
box will continue to do lookups for domains for which we have  
authority, but lookups of outside domains just flat out stop until we  
restart named.

I am curious if anyone else has experienced a similar problem with  
BIND 9.4.1-P1, and if so, if there is a fix for this.

Thanks,

--Craig