Bind sometimes stop unexpectly

[Vahric MUHTARYAN]

Hi Everybody , 
 
            I'm using fedora core 3 and bind 9.3.1 , some times bind is
stopping unexpactly , anybody know or have this like issue ? 
 
I saw some core files there ? Any idea ? 
 
-rw-------   1 root root 160280576 Nov 15 16:55 core.2546
-rw-------   1 root root  47915008 Nov 29 16:30 core.2677
-rw-------   1 root root  35545088 Nov 14 21:41 core.3573
-rw-------   1 root root  70848512 Nov 18 14:58 core.7200
-rw-------   1 root root 239808512 Nov 29 16:25 core.7657
 
 
Thanks 
 
Vahric