rack32 6d ago
Why does my SSL auto-renew fail every 89 days exactly? · Web Hosting
I had this exact pattern on a BuyVM slice in Las Vegas. Turned out to be cron + anacron. Debian defaults to anacron for machines that might be off at night, but VPS is always on so both run.
Check /etc/cron.d/anacron and /etc/anacrontab.