There appear to be broken DNS servers. When asked for a CAA record (which, if it exists, specifies which CAs are allowed to issue certs for your domain), your DNS server returned an error, which shouldn't happen. It's OK to say "there's no such record", but your DNS host returned a failure instead.
Do you believe that this error on the part of the DNS server can be solved by creating some record in the DNS or is it an error that must be analyzed by the team of locaweb, supplier of the DNS server?
SERVFAILs can be tricky to track down because they don't always happen consistently. Something like temporary "bad weather" on the internet can trigger it, in which case there's nothing to be done.
How many times did you try? If you try again, does it happen every time?
Did you redact this error message? Was the domain in here your www.dominio.com one?
Since they are an EIG brand, it might take a while for them to fix it. In the meantime you could choose another DNS host. There are some good free ones like Cloudflare (just the DNS, not the CDN bits).
As the domain redirection service was working, I had not noticed the problem with the locaweb’s DNS.
I will study other alternatives, including installing the DNS server on my Debian.
But as I don’t know much about it, I will have to study a little.
If you don't know much about it, running your own public DNS server probably isn't the best option. Follow Jürgen's advice instead and use Cloudflare for your DNS--it's free.
I really believe that support would take too long.
I have tried 3 times to contact them about the problem and the answer is always the same: “you need to consult your hosting provider”. They look like robots talking! kkkkkk
So, I will try the cloudfire alternative in the short term and study how to implement a DNS server in Debian so that I can manage everything internally.