Keynote quits during movie playback

I use Keynote 6.5.2  for presentations in my classroom on my Mid 2010 Mac Mini (10.10.2).  Over the last month, whenever I play an imbedded movie, Keynote will randomly exit at any time in the movie to the desktop.   It looks similar to following a hyperlink, only Safari does not open.  The green "resume" arrow on the Keynote icon is visible on the dock and will return me to the movie, but it will start the movie over.  Could anyone please offer a solutions to this annoyance?

I figured out that deleting the quicktime-cache should help. I tried it. Now I can watch converted videos, tv-series without proplems.
But iTunes still freezes when I want to watch a movie rental, when direct3d acceleration is of...

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