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Second monitor flickers while connected through HDMI

Star I
System: Windows 10
Battery or AC: Both
Model: S510UQ (X510UQ in dxdiag)
Frequency of occurrence: One in a couple of minutes
Reset OS: Yes, didn't help
Screenshot or video:
Detailed description:Every second PC monitor I connect through HDMI flickers or turns black and reapears again after a second. I tried to update the drivers, change ever power settings to Maximum and reset windows and it still happens. I have two "graphics cards" - intel HD 620 and NVIDIA GeForce 940MX.
I wonder if there are any other S510UQ owners that faced the same issue.
It started about a year ago.
Appreciate your help.

Star I
An example of my screen when it turns black and reappear again.
It also flickers once in a while (no pattern that I could recognize).
It flickers more often when the CPU is working hard.
The cable, pc and electricity are all fine. I checked this setup with two other newer ASUS laptops and they both where OK (no flickers whatsoever).

Community Legend II
Hello ofridan22,
Please kindly send the device to our service center for further examination.
Sorry for the inconvenience caused.
Thank you.