I have a hiss on my 6S+ as well but it is the same static/white noise that you hear. however on my 7+ this is not static there is an audible LOUD hiss at the beginning of each video almost sounds like a wave crashing at the beach and then it goes back to a (slightly louder than my 6S+) white noise. This is not at all the same and has to be an issue. I'll be returning mine tomorrow and probably just gonna hold off. I was on the fence before today and this is making my decision easy
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Quick example..you can see how it goes away after a few seconds..happens every time i take a video
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Here is my 6S+ in comparison