Regarding shut down of iPhone
in recent days my iPhone is shutting down too much even at battery of 40% and gets hanged and does not open until I plug it to charger and battery falls very fast what problem is this
Question marked as
If you have an iphone 6 or later, with iOS 11.3 or later, you can check your battery health going to:
Settings>Battery>Battery Health and tap on it...
What value is shown there?
or
have your battery checked at your most convenient Apple Store or Authorized Service Provider:
Apple - Find Locations - Location Selector
Regards
Giulio