|This is happening during playback on the camera?|
I believe that comes with an 8 gig micro SD card. Can you remove it and play the movies on your PC? (You may need to buy a card reader compatible with the camera card.) I think they're in .mov format so quicktime or VLC media player should work with them. If their audio is OK on your PC then there must be something wrong with the playback on the camera.
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