Been having this issue for about a week, but it seems it won't be going away for the moment, so I'm making a post about it. As the title implies, every 24 or-so hours, my ssl certificate from Let's Encrypt resets to self-signed. This is a pain (obviously), as it gives warnings to anyone who vists my site, and messes with my Telegram bot webhooks. I will point out that my SSL is close to expiry (about a week), but I don't see that this would be an issue.