Video clips in imovie 10.0.5 lagging

I am using iMovie to make a video for someone, this is one of the first time I am using it. I currently have two problems.
Problem 1
I gathered a bunch of clips from different people (which were shot at different resolutions, and different cameras etc.) and for the most part when I put them together it is fine, but there is one shot in quite high resolution, and I find that transitions from this high quality one to the other ones is laggy and freezes a bit (audio continues fine) before the picture catches up a few seconds later. I read something about frame rate, I'm not sure this is the problem but could someone please tell me how to solve it? All the other clips are completely fine and have smooth transitions to each other, any clips that follow or come before this high resolution one lags.
Problem 2
In one of the clips, for some reason the audio dips. It cuts off the beginning and I am looking at the sound mounds that it just goes from silent to normal back down to silent. When I listen to the video on vlc, it is completely fine, and enhancing the volume on iMovie doesn't seem to do anything to bring the audio back on those parts that are "silent". Did something go wrong when I dragged it onto iMovie to work on? Because it works fine otherwise and I have no problems hearing it.
I am running OS Mavericks, late 2011 model.

Hi
How was the Audio recorded ?
.aiff ? .mp3 ? what ?
Bit depth 12-bit or 16-bit or ?
Frequency: 44.1kHz (as on Audio-CDs), 48kHz as on Video Cameras or 96kHz (as Pro recordings) or or ?
I would try to find out this then use an Audio-Editing program as AudaCity (free from Internet) and make all the same as Your Video project.
Yours Bengt W

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