Eagle_Owl No need to apologize. But yes, I had checked all notifications settings that I could think of, all seemed fine...... except:
For the phone app within notifications there is a setting called, "Allow full screen notifications". It was disabled. Now that I enabled it, the problem has gone away. So, I guess that was the problem. I think......
You see, I never lost my phone so no one else has access to it, there's no one here so only I have access to it, and I know I wasn't playing around with the notification settings, yet somehow in the past day or so it appears this setting changed. I know this sounds crazy, but I'm at a loss to explain what happened.
(I would mark this as solved if I could figure out how to do that.)