Hi Patrick,
I have two that behaves the same way whenever the temperature inside of the house is higher than 78 F.
But whenever gets bellow that, or if I blow some cold air on them, they start to work again (dark spots and a "fake bleeding" inside of the screen disappears).
Do you have it in a hot room temperature?
I don't know how to fix it, but I know to make them look normal at least
Let me know if works for you