Weird sound when recording videos. (Samsung S5 NEO)

I bought a Samsung S5 Neo, maybe 2-3 months ago, it's really great except for the sound quality in video recordings. It seems to make the sound when the image is trying to focus to make it clear.
I just wonder if there is a way to turn that off or if I just have to deal with it.

I would post a link to a video where I show the problem, but ofcourse that is not possible...

Hi, this isn't normal behaviour for this phone - if you have only had it a couple of months speak to the seller and ask for a replacement or your money back.