Samsung Galaxy A5 microphone noise

Hi! I have got a Samsung Galaxy A5 2017 and I've been having a problem with its microphone since I bought it, in February. Firstly, I thought it is something that will get fixed with the following updates, but it hasn't been fixed so far. Here's a recording with quiet surrounds:
Does anyone have the same problem? What do you know about that little sound which keeps being there everytime I record a video or an audio? Thanks in advance

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