If your phone has been randomly restarting itself, there are a few potential steps you can take:

1. Charge the Battery:Make sure the battery is fully charged, then power down your device for a few minutes.
   
2. Clear the Cache: Clear the cache memory from the recovery menu. This often helps with recurring errors and malfunctions.
   
3. Reset the Device: If the problem persists, try resetting your device back to its factory defaults. Make sure to back up your data beforehand.
   
4. Replace the Battery: If the issue is still occurring, you may need to replace the battery.
   
5. Contact the Manufacturer: If all else fails, contact the manufacturer for service.