I carry my mini in shirt pocket or loose front jeans pocket and have no cracks as you describe. KOBO Mlni has a screw in each corner hidden under back cover. They help improve rigidity but could cause your cracks if over tightened or if reader was racked/twisted some how. Dropped, while inserted, or removed from tight cover, maybe over tightened screws at factory or while replacing internal uSd card?
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