Video on Exported Movie Freezes During Playback, Audio Continues

This is a reoccurring problem I've found in some of my exported movies. After successfully exporting a project (in full quality), I view the movie in QuickTime player, where, somewhere in the middle of the movie the visual freezes and stays frozen on the same frame for the remainder of the movie. The audio however doesn't skip a beat and continues normally. The playhead in the QuickTime player continues without interruption as well. The location (or frame) where the movie freezes is always the same every time the movie is played. If you attempt to skip over the freeze spot by clicking later in the timeline, you'll successfully move the playhead forward to where you want but the visual is still frozen on that frame and the audio is fine as well. This suggests to me iMovie rendered the movie to a certain point and then, for some reason, rendered a still frame for the remaining duration.
The movie plays normally in the playback/preview within the iMovie app. itself.
The only clue I have is it seems to have this problem after a slow or fast motion effect is used. The frozen frame is generally the last frame in the clip that has a slow motion effect. If I go into the project and move the end of the clip forward to erase the troublesome frame, export, and view, the movie is completely normal until it hits another special effected clip.
This is truly a hassle and the poor solution I've found to fixing it ruins the synching I've put a lot of work into.
Help would be greatly appreciated. Thank you so much.

I have had the same problem on multiple movies. I'm going to submit your post to apple feedback & I suggest you do the same. Have you found any solution? http://www.apple.com/feedback/imovie.html
I think the problem is related to running out of memory/virtual memory, so on another post I saw rebooting & shutting down other programs before rendering suggested.
Exporting in a smaller size worked for me, but I didn't create this movie to watch in postage stamp size. I'm a new mac user - what happened to apple's promise of things "just working"?

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