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@haeckerfelix I do have an IKEA Markus chair and one of screens does occasionally turn black for a few secs when I sit down. I even read that gas lifts of office chairs may cause problems with screens, but wasn't sure if it's an urban myth & looking into a different problem with a permanently bad signal (green fireflies). But the black screen I can now attribute to the chair instead of the cables or the screen. Why isn't it affecting all screens though, all three being the same model in my case?