Help diagnosing CAA SERVFAIL

[cpu]

I split this topic into its own thread since the root cause is different from the one you were initially replying in. Thanks!

@jror

But what I not understand is why I never had this problem until last week, I already issued several certificates in the past/ last months with the same name servers.

We recently made an API Announcement that explains why this started breaking for you last week. That post has advice on remediation. You will need to contact your DNS hosting provider as mentioned by @pfg (Thanks!)