Static problem in my room affecting my Dell screen

I've got the same thing. Switch table lamp on or off, screen goes black. Mostly only 1 of the 2 screens. Sometimes also when I just sit down, or touch something.

I thought it was a dodgy cable, replaced everything (FFS), and it's not that.

Now, when it happens, I make the following utterance: lol
 
The power supply probably has a very sensitive surge protection circuit that trips every time it detects the slightest voltage fluctuation.
 
winter=dry air=static
do you have the problem in summer as well?
 
Tried cleaning the buttons on the Dell? Swopped cables? Put Dell into a different plug socket?
 
At work, my screen goes blank for a few seconds when someone plugs in any device in the shared desktop plugs. It is also a Dell screen.
 
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