SOLVED: JF randomly stopped working

[TheDreadPirate]

Generally speaking, ISPs don't like home customers hosting on port 80 and 443. Some say it because your home connection isn't supposed to be hosting anything (get a business connection $$$). Some say they do it for security reasons. Your typical non-techy can't host a web server securely, something something.

I am leaning towards the former. I've never heard of ISPs actively searching for "servers" beyond port 80 and 443.

Something I'm not sure about is your cert renewal. Certbot requires port 80 be available, not sure how your setup gets its certs. Pretty sure NoIP can redirect port 80 to an arbitrary port that your server is listening on if your auto cert renewal requires port 80.