An anonymous reader writes: A recent iOS update to 10.1.1 fix Apple's Health application has had unintended consequences for many users -- shutdown at 30% battery remaining and lack of audio using Apple Earpods. Users on an Apple forum report that the battery indicator jumps from 30% to 1% (dubbed the 30% bug) and a reboot is required where the phone then runs for a few more hours. Some have taken the iPhone back to receive a replacement only to find the same thing happens. Apple has not responded to the 11 pages of forum complaints but apparently, Genius Bar staff have identified unusual discharging of the battery -- which does not make sense if a reboot temporarily fixes the issue and returns the battery indicator to 30%. It also appears to affect all versions of iPhone that support iOS 10.x.