I have experienced the same thing. In my case, it has been associated with FINDER, and I have resolved the problem by doing the following: Click the APPLE in the upper-left corner of your screen....Select FORCE QUIT....Select FINDER....You will be given the opportunity to RELAUNCH - Click that. It will kill and restart Finder without the Thumbnails Agent running. It will flare up again every couple of weeks, so just complete this procedure as required.
Prentice3
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