So since the device is broken anyway, grab the bottom left and top right corners and put your fingers in the middle and try to flex it. I betting that even though you think the case is "firm" that it will bend. It's not necessarily a point pressure that causes issues, but bending can stress the screen and with a bigger screen it's easier to bend it. As for the spontaneous nature of it: I've had car windshields that have gone for a year with tiny barely noticable crack that has suddenly gone across the whole thing "spontaneously" overnight.
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