It's a known weakpoint of the eInk screens in general. They're incredibly fragile, that's just how it is. You can break them with a single finger (if you press a bit too hard), it doesn't take all that much force. A single bump might set it off and by the time you notice you no longer remember the bump anymore (if you noticed in the first place).
Most cases do not protect against torsion/bending at all. At best they will distribute pressure and dampen some shocks... you'd need it to be solid all around, like a wooden/metal box, a bit of cardboard does not help much.
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