Flickering screens with Dell D3100 dock

[AlbanRampon]

Hello,
Is it a single blink or really flickering?
Is the content staying on that screen or is it moved to another display?

The trigger mechanism you describe is typical from ESD coming from gas lift chairs.
Do your HDMI cables have ferrite beads to eliminate transient spikes?
Do you also have the issue on DisplayPort or is that an HDMI only reproduction?

We have seen that HDMI is more sensitive to these spikes and the monitor would lose synchronisation. It takes about 1 second for the total occurrence... which is far too quick for Windows or a driver to do anything. I mean the OS takes more than a second to be able to show files on a simple flash drive.

That behaviour has been well known since 1993 when a white paper was written on that subject by Doug Smith.
Could you check the quality of your HDMI cable, if that's only taking place on HDMI?

Kind regards,
Alban