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A problem with iPhone 6S products randomly shutting down comes from a battery flaw found in a small number of models, according to Apple.
After a Chinese consumer watchdog group reported the issue, Apple is offering a fix free of charge to any eligible iPhone 6S user through its customer support sites.
On Friday, Apple explained on its Chinese site that the problem was found in iPhone 6S devices containing a faulty battery component. This component was "exposed to controlled ambient air longer than it should have" before it was assembled into the battery packs, Apple said.