I think most of us are using these on Nvidia GPU's. This to me sounds like it might be an Intel driver issue.
It's possible that it could be a cable issue, as those tend to have rather unpredictable symptoms, but my money is that it is an Intel GPU driver issue.
Do you have another computer you can test it on?
Thanks for your reply. I have an old HP Pavillon laptop, I have never had problem with it. But I set it in Extended screen mode so is a different situation. With the PC I only have one monitor, that is the Samsung TV.
I also tried video driver of MSI (from the website of the Motherboard) but no had improvements...
Unfortunately is not good time to buy an external video card (for their price) and I would not know what choose because I am not so expert (I am not a gamer, simply use this PC to enjoy video with good quality, also in 4K)