Untrusted why? Dig into the browser's cert details to find out. In Chrome devtools (ctrl+shift+i), select the security tab.
The other person who mentioned an SSL error said chrome said untrusted authority. It's a cloudflare-issued cert, dated Tuesday 00:00, so there shouldn't be any issues unless you've disabled the Baltimore Cybertrust root which backs cloudflare's intermediate cert. Or unless there was a transient error with the cert cloudflare was serving. Like maybe they were serving a bad cert, but only at one of their POPs? While theoretically possible, it doesn't make sense that they'd have any untrusted certs around anywhere.
depth=2 C = IE, O = Baltimore, OU = CyberTrust, CN = Baltimore CyberTrust Root verify return:1
depth=1 C = US, ST = CA, L = San Francisco, O = "CloudFlare, Inc.", CN = CloudFlare Inc ECC CA-2 verify return:1I suspect this is a one-off, but please do reach out to us if you still have issues, I've already passed this along to the team to fast-track support if you do send us an email.