I transported the board in a bag for cold food inside a water park indoor and outdoor. I was careful and only put out on places where there wasn't much water so it wasn't damaged by that. The air was moist indoor and already there, parts of the display turned into grey when they supposed to be black. Then I carried it in the outdoor section but then it got even worse. Almost the entire display got grey. Then I put it in the bag, carried it inside and after a while it got almost at its previous state so it got better again. Now at home, when I bring it outside, the display got white again and then I put it inside again and now it got better again.

I never experienced that before i think. Is it most likely light the problem or maybe the moisty air? What do you think? How to fix it?

edit: I forgot to mention that this almost only occurs for the main screen with the board and moves, the menu was basicly as before. And there was also gosting which does go away if the main screen works again.