Studio Display with Nano-Texture Issue

I have been using Studio Display for a few months now and today I noticed that there is a horizontal line across the screen that becomes visible when intense sunlight hits the screen. This line is visible even when there are no graphics on the screen. So I don't think it could be a problem with the panel, but I'm still not sure if it's related to the nano-texture on it. I wonder if anyone has experienced a similar situation.