When I am watching the video before I saving it, it runs smooth and fast. After I Save it and make create the video, there is a spot that always goes slow. it is a little bit after halfway that the video goes slow. After that spot, it goes slow for about 5 seconds, but then it goes back to normal speed. It hasn't happened with other videos I have made, and it isn't the clips I am using. I switched the clips around and it still runs slow at that part. How can I fix this?