Recently, many iPhone users have been complaining about their devices automatically shutting down. Apple has not offered an official explanation, but Apple customer service workers admitted that they have received many inquiries about the issue. 

“My iPhone still had 40 percent power left, but it suddenly powered off,” said Tian Tian, an iPhone 6 user. Some also complained about their iPhones shutting down when they tried to take photos. They were forced to charge the phone in order to turn it back on.

Apple has not yet provided a solution to this problem. They may be waiting because they haven't yet figured out the root of the issue, speculated Wang Yanhui, chief secretary of the Chinese Mobile Union.

An Apple customer service representative said the automatic shutdown may be related to the phone's temperature, operation or battery life. Some users have also cited failure to upgrade the operating system as a factor.

Wang added that the iPhone is more sensitive to temperature than other mobile phones. The representative suggested a phone case to help avoid shutdowns caused by low temperatures.

Other recommendations from Apple employees include checking the status of each app and paying attention to battery charge. Users can press the home button and lock button to restart the device. In addition, if problems persist, users can contact Apple to arrange for a repair.