Apple iOS 11 Starts Causing Problems Apple iOS 11 is packed full of features (including many secret ones), but following reports of several bugs my Upgrade Guide advised iPhone users in particular should hold off updating. This now looks a wise move because iOS 11 is causing problems.
A new report from mobile security firm Wander a exposes the issue: iOS 11 a battery killer. Cutting through the usual subjective battery life complaints iPhone and iPad users often post online after an iOS update, Wandera found concrete evidence of serious degradation. It did this by monitoring a "subset of 50,000 moderate to heavy iPhone and iPad users� on its networks running iOS 11 and iOS 10.