Semi-frequently, I see outages that go unreported on the status page. They used to have error rate and backlog depth graphs on their status page too so it was obvious (in a good, transparent way) when they were having issues even if a human hadn't (yet) updated the status page, but those graphs were removed.

Sure, twice monthly is a lot more than "not for 10+ years"!.

Anecdotally I think it's more and that the threshold for "errors above normal" is probably set pretty high. It feels like their infrastructure isn't very reliable and depending on which backend Cloudflare is routing you to, YMMV.