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I have read other accounts of similar cracking. Most (all???) have been in the graphite colored one.
It appears that they propagate off the lower corners of the screen. There must be a stress point under the case in that location. So if the graphite is the one, is the coloring material to blame changing the properties of the case or do they get assembled on a different line and different forms were used to create the upper-case component?
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