Apple introduced 10.2.1, the latest software update to its mobile device one month ago, which is now being praised for its ability to reduce the number of unexpected shutdowns for both iPhone 6 and iPhone 6S users.

The company notes that over 50 percent of active iPhone users have already updated to the new firmware and the rate of shutdowns is down 80 percent for iPhone 6s and 70 percent for iPhone 6.

According to Macrumors, the shutdown issue that is solved by the iOS 10.2.1 update is separate from the problem that caused it to recall a select number of iPhone 6s devices. In that case, as per Apple, some batteries had been overexposed to "controlled ambient air" during the manufacturing process, resulting in the need for a physical battery replacement.

As per Fudzilla, the company has given a number of reasons for the unexpected shutdown for the past few years including uneven power delivery by older battery units. Apple has even issued an iPhone 6S recall on a selected number of units made in September and October last year, due to those devices being overexposed to "controlled ambient air" during the manufacturing process.

The company says that all iPhones are designed in such a way that they will shut down automatically under certain circumstances including extremely cold temperatures. Some units have also been reported to shut down with around 30 percent battery percentage, to protect the internal components from low voltages.

In addition to its power management tweaks, Apple is reportedly going to add "your battery needs service" message to the battery notification screen on iOS 10.2.1. This will help to notify users that have a significantly degraded battery that it's time to get it replaced.

The company did not mention any fix for battery issues on both iPhone 6 and iPhone 6S which allowed it to quietly collect data before further explaining the issue. The company now advises all users of these devices lineups to upgrade to the latest version if they are experiencing any shutdown issues.

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