If you have an iPhone 6S that randomly shuts down, you're not the only one. Apple is aware of a problem that it says affects a small number of phones, and is offering customers replacement batteries for those units.
Last week, a consumer protection group in China asked Apple to investigate issues associated with iPhone 6 and iPhone 6S units that would randomly power off. Apple now says in a support post that it has "determined that a very small number of iPhone 6s devices may unexpectedly shut down". The company goes on to explain:
This is not a safety issue and only affects devices within a limited serial number range that were manufactured between September and October 2015.
If you have experienced this issue, please visit an Apple Retail Store or an Apple Authorised Service Provider and have your device's serial number checked to confirm eligibility for a battery replacement, free of charge.
The good news is that, unlike with Touch Disease, you won't have to pay to get your battery replaced. If you have one of the affected units, Apple will swap it out for you at no additional cost.
To get a replacement, your iPhone will need to be in working order. Moreover, if you have a cracked screen and that impedes with battery replacement process, you might have to pay to get the screen repaired before you can get a new battery. Users with problems should go to an authorised Apple repair centre or an Apple retail store.