MojoKid writes: Apple's iPhone 6s and 6s Plus were two of the most highly anticipated smartphones to launch so far this year. The excitement surrounding Apple's new refresh cycle flagships was so great that Apple reported record first weekend sales, with 13 million devices finding their way to customers. However, it appears that some of those customers are having a puzzling issue with their brand new iPhones. Owners are reporting that their phones are turning off randomly when left alone — even when the smartphones have sufficient battery remaining. "New Phone 6s 128GB turned off for no reason the last two nights," wrote Joachim Frey in an Apple discussion thread. "In the morning you then have to push the power-on button for a long time to get it started."