Missing thumbnails in Finder

Every now and again when I've had my MacBook Pro running for a period of time, the thumbnails for some of my files stop generating and is blank - just an empty white space. When I reboot/restart, the thumbnails come back. Does anyone know why? See attached screenshot, where the bottom two rows have blank thumbnails.

Yeah, apparently it's only an issue with external hard drives? Not a big deal to me. Just a slight pain at times, but clicking on the file name and hitting space still brings up a preview of the image, so that's enough for me until it gets fixed. Thanks!

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