So I go into a folder, and all the thumbnails load up slowly. Then you expect it's built up the cache so next time you go in it's instant, right? Nope! All forgotten.

Every single time I go into a folder it's reset.

I tried deleting to rebuild the cache DB files but they were all locked out, and I can't disable automatic maintenance (which may be erasing the thumbnail cache) as the option to do so isn't available in Windows 10.

Any ideas?