CHUWI LAPBOOK - piping sound

Hi, I have lap book pro, new one and I have problem with piping sound when notebook going to sleeping mode. When I’m using notebook all is good, all is silent, but when I close the notebook, it will start piping sound and its really not good for the ears and only solution is turn off and then again turn on it. Do you have any advice please? And this sound is going from the left side, where is charge. Thank you

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