After Apple acknowledged the "Touch disease" issue of the iPhone 6 Plus, now the following generation faces issues - a limited number of iPhone 6s phones experience unexpected shutdowns. Apple clarified that this is not a safety issue, but the battery will need to be changed. You need to visit an Apple retail store or an authorized service provider. Your iPhone will be examined beforehand to make sure it needs and is eligible for the repair. Only iPhones 6s phones built between September and October 2015 are affected. You can call Apple with your phone's serial number to check if it's...
Source: http://www.gsmarena.com/apple_begins_repairs_on_iphone_6s_units_that_shut_down_unexpectedly-news-21741.php