I use a MEdge cover for my iLiad. What breaks the screen is sharp pressure at a point. For example the corner of a book pressing into the screen in a backpack. Covers help, but you still need to be careful.
When you send the device back for repair they will be able to tell if this is a manufacturing defect or mishandling. However, you are obviously at the mercy of what they decide. I have seen reports of iRex agreeing that the screen broke due to a defect in some cases. I don't know about Sony because I don't follow those forums.
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