Iphone se counting non-existent steps overnight
Since the upgrade to iOS 12, my iphone SE has started adding a regular number of random steps each hour. It happens during the day when the phone is still, and overnight, even when it is powered off. They show up in the steps data in the Apple Health app. Screenshots attached. Is there any way to calibrate the phone or fix the app? Please dont tell me I have to buy a new phone - this one is less than 2 years old...