One of my security plugins is having sporadic problems. After looking at the logs and plugin folders on the server, I suspect that one of the plugins that I auto-updated about 6-7 wk. ago did not properly clean up after itself during the update. I have manually deleted it and did a clean reinstall. I will take further action, if the clean install doesn’t eliminate the problem.
Sincere apologies to those who have been inconvenienced.