On Monday, Apple released an update for its latest iOS 12 software and iOS 12.0.1 addresses a bug that had been affecting users of the new software.
Some users were plagued by charging issues and the new software addresses that.
To get the update, go to Settings/Software/Software Update.
The update also fixes a problem with some iPhones choosing slower 2.4GHz WiFi networks instead of available 5GHz networks. The update also fixes a number key error on iPads.