Monitor turns off for about a second every now and then?

I used to have the same thing with my old Samsung, it happened every time the fridge compressor clicked on.

I bought an APC UPS and that solved the problem. Bad wiring in the flat I guess.

Try with just a surge protector first.
 
Happens to me with my Dell 27''. I think it's because I also have it connected to my TV (use it to change output screen to watch movies).
 
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