iPhone Keeps Restarting Randomly? 10 Fixes That Actually Work

An iPhone that keeps restarting randomly can point to a weak battery, damaged system files, low storage, or hardware damage after a drop or heat exposure.

Quick answer: Start with a force restart, Battery Health, free storage, and the latest iOS update. If your iPhone also freezes or crashes apps before rebooting, check lagging and freezing and apps crashing on iPhone.

Why this happens

Most random restarts are tied to power delivery problems, unstable update files, aggressive app crashes, or deeper hardware faults that software fixes cannot hide for long.

Step-by-step fixes

1. Fix

Force restart the iPhone first.

2. Fix

Open Battery Health and look for poor capacity or performance management warnings.

3. Fix

Install the latest stable iOS version.

4. Fix

Free space in Settings > General > iPhone Storage. Use this cleanup guide if needed.

5. Fix

Delete any app that started causing trouble shortly before the restarts.

6. Fix

Reset All Settings to clear corrupted system preferences.

7. Fix

Use Recovery Mode if the phone will not stay on long enough to troubleshoot.

8. Fix

Restore the iPhone after backing up if the issue keeps returning.

9. Fix

If restarts come with heat, check overheating while using apps and hot while charging.

10. Fix

Treat endless reboot loops after restore as a hardware warning.

When to get help

The phone restarts in a loop and cannot stay on.
Battery Health is poor or the device shuts down under load.
The issue started after impact, moisture, or swelling.

Related guides on AppFixing

FAQ

Why does my iPhone restart when the battery gets low?

That usually points to a worn battery that cannot deliver stable power.

Can one bad app trigger reboots?

Yes. A badly behaved app can trigger crashes that look like restarts.

Should I restore my iPhone?

Yes, after backup, if basic fixes do not stop the problem.