All of my sites that use APO also use the Cloudflare WordPress plugin.
Today I discovered that on all of them, the APO option had been set to OFF.
It was most definitely ON before, and I could not have accidentally deactivated it on multiple sites. So I’m trying to find out what might have caused this.
The only thing I have changed recently is my DNS setting. Could a change of DNS settings cause a temporary loss of connection between Cloudflare and the Cloudflare WP plugin, causing it then to set the APO option to the OFF position?