I also observe annoyingly often that the site
https://bitcoinexplorer.org/ is either very unresponsive or down like it is now
(. I just checked myself and the
cloudflare.com error page indicates the site is unresponsive for whatever reasons.
But I have my own local instance of bitcoinexplorer, so I don't mind if the real site is down. I just wonder why it's so sloppy maintained.