Hey there, this is a common issue on iPhone X and above models when the housing is replaced or the back glass is changed or the earpiece is changed or the power button strip. Would you be able to provide me with the Panic Log so I can check it and probably pinpoint the issue? You will find Panic Logs in Settings -> Privacy -> Analytics & Improvements -> Analytics Data -> and Search for panic-full-xxxx-xxxx.ips and attach screenshots of the latest available panic log. Cheers!