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Very odd, but I have seen something similar with other Cloudflare sites when accessing from Chrome too. I am wondering whether there is something odd at our side and so have asked internally.
It would be great if you were using Chrome and could confirm it still happens once per day, and when it does a screenshot of the Chrome page (which is more informative than the IE generic error page).
At least once a day, I get this HTTPS fail. Couple of refreshes and it goes away. Not sure if it's all the corporate MITM proxy's fault.