iPhone 6s was one of the devices most affected by the “unexpected shutdown” issue facing several iPhone users. Other models that had this problem, and continue to do so, are iPhone 6, 6 Plus and 6s Plus.

Though no specific patch was applied for the issue, Apple recently confirmed that iPhone 6s devices with iOS 10.2.1 installed on them are not as likely to face this issue moving forward.

According to Apple, installing that version of iOS has reduced the occurrence of the problem by up to 80 percent on iPhone 6s and up to 70 percent on iPhone 6.

In a comment to TechCrunch last month, Apple said:

With iOS 10.2.1, Apple made improvements to reduce occurrences of unexpected shutdowns that a small number of users were experiencing with their iPhone. iOS 10.2.1 already has over 50% of active iOS devices upgraded and the diagnostic data we’ve received from upgraders shows that for this small percentage of users experiencing the issue, we’re seeing a more than 80% reduction in iPhone 6s and over 70% reduction on iPhone 6 of devices unexpectedly shutting down.

We also added the ability for the phone to restart without needing to connect to power, if a user still encounters an unexpected shutdown. It is important to note that these unexpected shutdowns are not a safety issue, but we understand it can be an inconvenience and wanted to fix the issue as quickly as possible. If a customer has any issues with their device they can contact AppleCare.”

The root of the problem appears to be older batteries, which tend to deliver uneven power to the device, with sudden spikes sometimes triggering a shutdown. The fix essentially addresses the power management system via an update on iOS 10.2.1.




Apple says it’s not a safety issue as much as one of inconvenience, and the fix appears to work four out of five times on iPhone 6s devices. And because the age of the battery appears to be the root cause, Apple has included a “your battery needs service” message within the battery information screen in iOS 10.2.1 settings.

On its website, Apple urges users of all Apple devices to always update to the latest software. While this could help eliminate the battery issue altogether, it’s also good advice in terms of device security. Apple also advises against exposure to ambient temperatures outside the allowable range of 0-35 degrees Celsius, or 32-95 degrees Fahrenheit, especially for iPhone, iPad, iPod, and Apple Watch, calling this the “Comfort Zone.”

In addition, Apple asks users to remove certain types of cases while charging, especially if users see a noticeable increase in device temperature.




We don’t know when the issue will be resolved 100%, but if you’re in the unlucky 20% of users of iPhone 6s still facing the issue despite upgrading to iOS 10.2.1, you can always contact AppleCare to look into the issue for you.

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