To resolve auto restart issue please follow below given steps:-
1. Check device in safe mode:- Using Safe Mode on a Samsung phone allows you to force the device to run the essential operating system, and disable most 3rd party applications. To enter in safe mode:- Press and hold the Power key, when Power off icon appears > Press and hold the power off icon. To exit safe mode restart the device.
2. Reset the device:- Before resetting, kindly create data backup of your device via SMART switch mobile application or http://www.samsung.com/in/support/smartswitch pc suite. How to reset:- Settings > General management > Reset.
If the issue still persist, kindly register your concern in Samsung Members app along with short video, screenshot and error log file(Samsung Members app > Get help > Feedback > Error report/ask question). Note: Please send device log files within 15 minutes of issue occurrence along with the exact issue details.
