My wife and I both work from home. I work in a spare room and she works from the living room. Our desks are separated by the spare room wall. For a long time, every time she got up from her chair my monitor would black out for about a second.

I think the issue is that she sits on a blanket, so when she gets up it generates static electricity. Though, she has a similar monitor and I actually have to monitors side by side. I'm not sure why just my monitor was blacking out. It also does that when I turn on a small fan under my monitor.