I have o DNS servers, I'll call them ServerA and ServerB. Both are authoritative servers and ServerA is listed as the Dynamic DNS server.
There is a forwarding list assigned and everything seems to work fine,

The way I understand how this works is that ServerA and ServerB are =suppose to forward DNS references they don't know to the servers on
the forwarding list. If one of the two DNS servers go down, the other is
suppose to respond to DNS requests so the user sees no interruption.

My problem is that is when ServerA goes down, for any reason, DNS resolution stops, even though ServerB is still running fine.

Any ideas??