Dear Samsung Member,
Greetings from Samsung Customer Support!
To resolve "Auto restart" issue please follow below given steps:
Go to Settings > General management > Reset > Turn off auto start.
To resolve ""Device hang issue" kindly follow the given below steps:
1) Remove third party application: Settings > Apps > Select the third-party application from Apps Eg. DU Recorder > Uninstall.
2)Reset the device and before resetting the device make sure to create data backup of your device via SMART switch mobile application or http://www.samsung.com/in/support/smartswitch pc suite.
Settings> General Management> Reset.
If the issue still persist, kindly register your concern in Samsung Members app (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.
Thank you for writing to Samsung.
Samsung Customer Support