Choppy Footage With Iphone App

I hope you won't mind going to Youtube and Looking at my Video that is about the cheapest guitar to help(I cant post Url in here I guess) Channel Is Searching For Tone- I NEED HELP(More ways than one
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In the very beginning and about the 5 minute mark the video becomes very choppy. The beginning is cut from about the same time as the 5 min mark. What can be causing this?
it is in the raw footage too not caused by editor

In the very beginning and about the 5 minute mark the video becomes very choppy. The beginning is cut from about the same time as the 5 min mark. What can be causing this?
it is in the raw footage too not caused by editor