Corners chipping

I have had this since I received my kindle. It has only been 6 mos and my kindle is either on my bedside table or in my bag. I have never dropped it, nor have I hit it against anything. Much to my surprise, the top corners of the plastic surround holding the kindle in place started chipping. There are now chunks of plastic missing from both corners and I had to purchase a new case since I was afraid my kindle would fall out.

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