I think I might have cracked it. Could be wrong. BUT, after I had AVG premium installed, AVG "tune up" came with it. That is the only think I have run since the first error. I have always used CCleaner in the past, which I figure tune up is the AVG version.
When I looked at what it was removing as system junk, there were 3 sims 4 items there. So, I won't run it again, and I'll wait to see what happens.
Here is a screenshot of the system junk. Could deleting one of those cause the problem?
https://i.imgur.com/Rs5wIfI.png
