@haeckerfelix The leader of hardware development told me about a similar issues with chairs that he had at a former job in the electronics lab.
And btw. what your are doing with copper foil etc. is the opposite of insulating. You actually try to short circuit the housing of the gas spring to earth. The electric charge produced by the gas spring then dissipates via the connection to earth (path to least resistance) before it builds up to become an emp and mess with your display.