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The final break may not happen at the time the stress is applied to the screen. The substrate is nearly as thin as a piece of paper (do a search on here for teardown pictures if you want to see it). It could have developed a stress fracture that you wouldn't see and then at some later point just a bump or expansion/contraction from a small temperature change could have caused it to completely break.
And IMHO I think bending/twisting pressure is the biggest killer.
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