When did this problem start and was there an update of anything involved when the problem started?
Can you run or install and run the Health Check plugin and report back its findings to us?
https://wordpress.org/plugins/health-check/
I’m wondering if this might be a simple problem with the Rest API.
I’m also going to suggest an alternative if you wish to try it should you be running into problems of any sort with our new Block Editor.
https://wordpress.org/plugins/classic-editor/
Install the Classic Editor plugin for a bit to revert back to that TinyMCE editor as a temporary fix if that gets you to where you can at least maintain and add to the site’s content.
That health check debug info would really help us here in the meantime.
BTW: I’m no big tattoo fan but I admire your work.
@jnashhawkins
You are an absolute star.
I ran the health check and it was a plugin issue.
I installed “Smartcrawl” SEO yesterday and this is also when I noticed the issue.
I deactivated and all editing again.
Also thank you for the compliment