On the morning of November 21, Apple said that some iPhone 6s had the problem of random automatic shutdown, but Apple claimed that there was no security problem, and only a small number of iPhone 6s produced in September and October 2015 had this problem (the first batch of iPhone 6s).
Apple said that if these iPhone 6s users encounter automatic shutdown problems, they can provide free battery replacement services, and users can replace them at the authorized service center of Apple retail stores. However, please note that only the machines produced in September and October 2015 will provide free battery replacement service.
If you want to trace the origin, I'm afraid that the China Consumer Association is the greatest contributor. Last week, it received complaints about the automatic shutdown of the iPhone 6s. Some machines even cannot be started with 50% power. In addition, Apple also said that this batch of iPhone 6s in other regions may also have this problem, and will provide battery replacement services worldwide.
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