I will try that. Thank you.
In Gutenberg editor, you add a ‘block’ for a new type of content, eg headline, image, paragraph. It will also automatically create a new block when you hit return for a new paragraph. It is like a page builder.
(I would submit a screenshot but I don’t see a way to upload on the forum.)
That had occurred to me. I was about to clear my cache when they started working again. I will need to keep monitoring it. Thank you for your response!