Auto renovation skips www subdomain

Hello.

A problem has started occuring during the last two weeks (as far as I know) that my certificates don't renew correctly. www-subdomain keeps missing,  and most of the sites are using the www-subdomain as their primary site address.

The logs show the following:
domain.tld AutoSSL trying domain.tld (nowww)

This has happened a few times before, but now all of the domains keep doing the same thing. All www-subdomains are using CNAMEs in DNS. If I renew them manually, www-subdomain gets certified normally.

Any help appreciated.

The problem still insists. However, I noticed a new turn of events regarding this problem. Now, if I renew the certificate manually, my .conf -files related to the domain I issue the renew on get deleted, and I have to rebuild webserver conf to get them back.