This. For example, the iPhone 6 came out in Sept 2014, and by Nov 2014 (two months later) threads were beginning to appear about it in the Apple support forums. e.g.
https://discussions.apple.com/thread/6686660?start=0&tstart=0
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As time went by, more and more people had it happen to them. (Some of my daughter's teen friends had it.)
Even AppleInsider, a rabid Apple supporter,
ran an article this past August where they checked with
four Apple stores over about a week, and found _
over 780_ iPhone 6 and 6+ owners who had the problem. Up to 37% of iPhone 6+ repair appointments turned out to actually be caused by Touch Disease.
Now consider 100 weeks and hundreds of stores. And that's just people who live near a store. Too early to tell, but it might've affected millions, even tens of millions.
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Nor does it happen just because of falls. As one Apple Genius privately said to AI:
"
It's about time that the Apple press got a whiff of the problem," one Apple Genius said to us. "I'm getting tired of pulling service stock out of the box, and seeing the exact same problem that the customer has on the replacement before I leave backstage."