Today I discovered that my Nintendo Switch's screen appears to be ruined. The coloration of each corner has darkened and become yellow. Kind of like screen burn-in, except it's not. I rarely ever remove the screen from the dock because I only play using docked mode. The only thing I can conclude is that leaving it in docked mode for too long will damage the screen. I would say that, except I've had a Switch for 4 years now, mostly docked, but I played it in portable mode like 6 months ago maybe? It was fine then.