Why "unable to renew a HTTPS certificate for custom domain name"

I just accessed our site as admin and found that message from 2/22. Before I dive into finding out how to log in and fix this at our domain registrar, can you give me a hint as to why - after nearly ten years of using this domain name without problems - we are running into this problem?
Club number 2238, U Speak Easy Toastmasters, www.uspeakeasy.com

I am not a technical person and I remember a long headache filled night when I first set this up dealing with the registrar at that time. Probably a vain hope on my part that this is an error. Please enlighten if possible.

By the way, none of the links in that message to the admin seemed to be of any help in any way whatsoever to me.

Elena

Your domain is ok. The cert renewal runs automatically on a weekly basis. Occasionally a momentary glitch blocks the communication between the cert registrar and the website host. The related admin message in this case is item e; 'We were unable to connect with the free LetsEncrypt! service to create the certificate.'

Nothing needs to be done as the following weekly cert renewal will likely succeed.  However, I ran a manual renewal now that succeeded;

Thanks so much for the quick check. That's a relief!