Strange named failures

[Ogogon !!!]

Colleagues, please tell me what could be going on.

There is a bind918-9.18.26_1 server on the FreeBSD 13.4 platform.
Periodically, it stops resolving incoming requests, but after restarting 
the program, operability is restored.
There are no alarming messages in the log files. I've heard similar 
complaints before.

How can I understand what this is? I am ready to provide the necessary 
additional information.

I would be grateful for your help.
Ogogon.