Hi!
I have started this thread, but it got closed because I didn’t reply in time.
The 404 page is looping. I have set up a 404 layout on a test site, and it loops there as well.
I have turned off all plugins, deactivated the child theme, deactivated caching (no CDN), removed all global CSS, have the latest theme etc. Nothing helps.
It appears that the more posts are published, the more time the 404 page is looped over.
The login to the website from the other thread is still active, and I will give you the login for the test website as well.
Thanks!