Latest iOS 10 update has significantly reduced iPhone 6 and 6S random shutdown issues

Over the past few months, some iPhone 6 and 6S users reported that their phones would randomly shut down, forcing users to plug in their devices to bring them back to life. While Apple has offered a repair program to replace potentially malfunctioning batteries, the latest update to iOS 10 should help automatically fix the issue.
As reported by TechCrunch, iOS 10.2.1, released in late January, has led to an 80 percent reduction of unexpected shutdowns on the iPhone 6S, and a 70 percent reduction