Hi Steve,
We would like to follow up on that status of your concern. What specific troubleshooting steps have you tried so far?
We look forward to your response.
I received a fix from fs1853 and Beyond Novice's on Nov.16th 2017 and it's seems to be working
Disable Disk Cleanup in Task Scheduler:
Open Task Scheduler.
In the left pane, navigate to:
Task Scheduler Library -> Microsoft -> Windows -> Disk Cleanup
In the right pane:
Under Selected Item select Disable.
I set this back on Nov. 6th and it prevents the clearing of the thumbnail cache
Steve