tv show thumbnails all black

I started off with 9.9.16 and now on.18 but I seem to have an issue with thumbnail graphics not showing for tv shows every so often.  I have 90 shows served from freenas (along with the plex pbi) and when scrolling through them random shows will just have a black thumbnail rather than the actual graphic.  Some times going back to the main screen helps, sometimes different shows get the black thumbnail.

 

Is this just a bug or is there something I can do to fix this?

Should be fixed by 9.9.19 https://forums.plex.tv/topic/96779-rasplex-9919-fix-preplay-huge-perf-improvements/

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