Dear Samsung Member,
Greetings from Samsung Customer Support!
To resolve "auto restart" issue kindly follow below given step:
>> Go to Settings > General management > Reset > Turn off auto start.
If the issue still persist, kindly register your concern in Samsung Members app (Samsung Members app > Get help > Feedback > Error report).
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