lets encrypt should auto renew at 30 days before expiry
"All Let’s Encrypt SSL certificates, including renewals, are valid for no more than 90 days from their issue date. Thirty days before the certificate expires you will begin receiving renewal notices"
if the MBG hasn't renewed then it will at 21 days start to warn you
it DOESN'T wait until the current expiry date to renew it tries to renew 30 days earlier than its due to expire
Sounds like you have a renwal problem - there have been some recent issues with auto renewal - some servers require patching to get that to work
whats the MSL version the MBG is running ?
MSL warnings cant be changed
NOTE: Events are raised prior to, and on the date of expiry of the certificate.
Ensure to regularly check the event viewer or configure email alerts.
Certificate already expired: MAJOR
Expires in less than 1 week: MINOR
Expires in less than 3 weeks: WARNING
If I never did anything I'd never done before , I'd never do anything.....