Under Attack Mode
The site is getting hammered by access requests which appear to be using the sitemap to access ALL content. It’s like a DDOS attack.
This has resulted in the site hitting the resource limit and getting restricted by the hosting company, so I have switched on “under attack” mode, and also throttled anyone who tries to access too many posts or pages too quickly.
“Normal” users will only notice a slight delay on accessing each page.
Sorry about this. Normal service will (probably) be resumed as soon as possible.