Update the phone and apps, free up storage, boot into Safe Mode to see if a third-party app is the cause, and check battery health. If it restarts in Safe Mode too, back up and factory reset; persistent restarts after that point to hardware.
What's going on
Random reboots happen when the system crashes or the battery voltage drops under load. Older batteries often cause restarts when opening the camera or games, especially in the cold.
Symptoms
- Phone restarts randomly or during heavy apps.
- Boot loops.
- Restarts while cold or at low battery.
Common causes
- Faulty app.
- Low storage or buggy update.
- Overheating.
- Worn battery or hardware fault.
Try these fixes
- Update everythingSystem update and Play Store updates.
- Free storageKeep 10%+ free.
- Safe Mode testHold power, long-press Power off → Safe mode. If stable, uninstall recently added apps.
- Check batterySettings → Battery (some phones show health); replace if degraded.
- Factory resetBack up, then Settings → System → Reset options → Erase all data.
- RepairIf it restarts after a reset, contact the manufacturer.
How to confirm the fix: No restarts over several days.
Avoiding it in future
Avoid heat, keep storage free, install apps from the Play Store only.