Keynote 5.2 – Unexpected Error has Occurred Please Quit and Restart

Keynote 5.2 | Mountain Lion | MacMini

The problem: I launch my Keynote presentation, which is set to automatically run and loop, and after a while of it running, sometimes it stops the slideshow with the error screen "Unexpected Error has Occurred Please Quit and Restart". What is vexing is that it does not happen every time, just sometimes. Also, the same file, ran on a OSX Lion computer, does not crash.

What have I already done?: At this point I: have trashed preferences; re-installed Keynote; trashed preferences, restarted and then re-installed; I have opened the file in the Mountain Lion Computer, duplicated it as a new file, and re-saved it… all of these with no success.

Anybody else experiencing this issue? Any ideas on how to solve this?