DNS problem to specific domain

I have problems with DNS domains, sometimes specific websites go down.

The strange thing is that it is not on all websites, only some. And sometimes the site that gives the error changes.

When I try to access it from the browser I get an error in the browser:
DNS_PROBE_FINISHED_NXDOMAIN
DNS_PROBE_STARTED

I restart bind9 and it is solved.

How can I solve it?

start checking syslogs, to find out why bind is failing. Also verify your dns setup and if all servers are answering properly.

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