Apple and iOS 10.2.1 address unexpected shutdowns on iPhone 6, iPhone 6s

“For a while now there have been reports of some older iPhone models, namely iPhone 6 and iPhone 6s, shutting down unexpectedly. Apple introduced some diagnostics into iOS 10.2 back in December to try and determine what was happening and, with iOS 10.2.1, they’ve rolled out a fix.”
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