What causes jumpy video playback

I've noticed that some clips in my (iMovie HD6) jump around.  Could it be that the tape (I use Sony mini DV) Premium) is slightly sticking or what else could cause the problem.
Please help.  Thanks.

In the top middle of the Canvas and Viewer is a percentage button. Open it and make sure that "Fit to Window" has been selected.
If it hasn't you can tell because there will be blue scroll bars along the bottom and side of the window.

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