I doubt it will help, bute here we go!
https://social.technet.microsoft.com/Forums/en-US/b95576d2-9f66-4f87-9b2a-e3dbd3462bdf/thumbnail-cache-gets-deleted-on-every-reboot-win-10-fall-creators-update-1709-1629919?forum=win10itprogeneralDE
Frank
I was on the phone with Microsoft Help line for over an hour
That didn't help.
I told them all the fixes That have been talked about here and spoke to 2 so called Special Techs
They were both dumb as Stumps
after they wanted money from me to continue (that wasn't going to happen) so they hung up on me.
And then phoned my home number and said that they would not help again, why I don't know I was nothing but nice on the phone.
There is also a another problem I think is part of the same
I have Samsung (1T) SSHD drives on all my 4 computers and it also deletes the cache in the 8 gigs of flash just about every 10 or 12 hours and instead if a 35 second start up time to reverts back to a 3 minute startup time until I restart the computer 10
more times and so on the next day
That also started as soon as Fall Creators update started, same as the thumbnail problem.
By the way neither of the 2 fixes that have been talked about didn't worked at all for me
I have also formatted and reinstalled a fresh version of 1609 on a new drive (same problem)
Steve