Dkim key has changed by itself

I’ve been using virtualmin/webmin many years, and i dont remember since when i have dkim signing of emails enabled, but never i had a problem.
Now, a user of one of my websites reported me that he didnt receive an email that should be sent automatically from the web, so i tested that and email is sent, but goes to spam because dkim not valid key.
I have not changed the key, never. And its a problem for me because i have some DNS servers outside webmin, so i have to update the record for too many domains.
What could have happened?? Is there a way i can recover old key?
Thanks

This link offers some methods to test if indeed your install of Virtualmin is sending out DKIM signed email: https://www.appmaildev.com/en/dkim/

Based on the result, you can configure Virtualmin | Email Settings | DomainKeys Identified Mail

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