The site is hosted on Google Cloud Run, which seems to have been having some intermittent problems for the last couple of days. EDIT: some other people have had the same issue and the Cloud Run team are investigating
Yep — I added our details to it. I mentioned the problems we were having on Twitter and a Cloud Run PM came to help immediately! So I'm hopeful we'll get a resolution before long. (Aside from this glitch, Cloud Run has been great for us, and we're looking forward to it coming out of beta)
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Sounds like a very Google-cloud/appengine issue. Maybe it's time to rewrite a bunch of things(very appengine again)