Quick Time Movies start halting after 20 minutes

I have a lot of movies in my presentations, most 30 minutes or so. After 20 minutes the Quick Time movies start halting, as if there's only 10 frames per second played, audio has no problem. The movies are made in FCP and exported as Quick Time movies. Anybody else has the same problem?

I found out that if you stretch the moviescreen too much Quick Time can't handle it any more ( stretching and playing) and after about 20 minutes it starts halting ( as if it only plays 10 frames per second).
I play the movies on a big screen with 500 x400 pix, that works fine!

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