I'd test it out..shut it all off and see if it still stays on. Do a battery calibration and set up smart actions to turn off WiFi and data when your screen is off and phone isnt moving. Have you FDR your phone? The reason why I ask is because something during the update maybe causing your battery drain. If you don't want to FDR, slowly uninstall apps you don't use one at a time and see how the phone responds when that apps isn't on your phone. It may not be a downloaded app and could be a system app..but if that is the case, then an FDR (Id do 2) would be the best thing to do..