Second monitor flickers while connected through HDMI

- 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:
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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.
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Comments
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).
Hello ofridan22,
Please kindly send the device to our service center for further examination.
Sorry for the inconvenience caused.
Thank you.