Ursprünglicher Beitrag von: Jacob Miller ,
Assuming there are no other variables like water damage, drops, etc I would agree that a reset is the the first step if you have indeed replaced the hardware already. You can try resetting some of the other settings in General>Reset>(options) also. It may be related to the newer update if there is a software conflict with one or more apps that are installed. The iOS 11 updates were riddled with bugs for many devices.