Device restarts on its own. What can we do?

Please tell us some basic information before asking for help:
- Model Name:8-256gb
- Firmware Version:.165
- Rooted or not:not
- Frequency of Occurrence:
- APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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Hi, my device restarted out of the blue 3 times in the last 24 hours. I know there are a few owners with a similar issue... Can we do anything to prevent any unwanted effect?
Thanks in advance.
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Comments
There's only one advice and that is backup and factory reset. If it doesn't help, then you have a hardware issue and need repair
What if phone is out of warranty and has an hardware issue
I am also facing the same issue