So I created a video in Movie Maker and it all sounds and looks good when in Movie Maker. All sounds are at the level I want and need them at, and all cuts and edits are made. 

I saved the the movie to my computer and it's a working MP4 video. The only thing is, at one random point, the audio just sort of lowers itself. I have watched this multiple times, waited a while and opened the video again. Re-saved and still the audio drop is always at the exact same time. 

In the movie maker there is no audio drop. It's only in the saved video. Does anyone know what causes this or how to fix it? I would rather not have to redo this video.