My iPad Pro 9.7 has been rapidly draining battery power ever since I updated to iOS 11.4.1. I took it to the Genius Bar and their diagnostics said that the battery was good. They put the iPad into DFU mode and reloaded the OS. We set the iPad up as new rather than restore. And still the battery is rapidly draining. I’ve turned off location services, background refresh and email push. Is there anything else that I can do?