Losing audio and freezing frames

Hello,
I have Mountain Lion and iMovie 11. Since my update to Mountain Lion I have the following problems:
Some of the scenes I moved from events to storyboard freeze and the original audio stops playing. When I delete these scenes and want to repeat the above actions, even the scenes in the event have no noise anymore.
Even stranger: they are not always the same scenes that freeze and loose noise. They differ al the time.
You may suggest that I lack memory but that is definitely not the case!
I am not an expert and hope to get an easy to understand answer, if anyone knows what my problem is.
Thanks anyway.
PD

I haven't experiences this errors
I got almost the same setup as yours
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Losing audio and freezing frames

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