Try force restart < press power key with volume up key for 8seconds > I would to like you inform no any data will lose in that process i hope your device will solve.
Kindly follow the below mentioned step to improve the performance of the device
Check Auto Restart should be Off: Setting> General management >Reset>Auto restart off.
Kindly attach the log file and send it to us in the Samsung member application (attach when the issue occurs within first 15 minutes of the occurrence of the issue.):- Samsung Members App > Feedback >Error report > Attach log file for any issue
