iPhone Randomly Restarts? 9 Ways to Fix It

Does your iPhone randomly restart while you're using it? Your iPhone may suddenly shut down, show the Apple logo, and turn back on without warning. This issue can happen on both older and newer iPhones and may be caused by iOS glitches, problematic apps, low storage, battery problems, outdated software, or hardware issues.

If your iPhone keeps restarting randomly, don't worry. In this guide, we'll explain the possible causes and show you 9 effective ways to fix an iPhone that randomly restarts, starting with simple troubleshooting steps before moving to more advanced solutions.

Why Does My iPhone Restart Randomly?

If your iPhone randomly restarts, the cause may come from either software or hardware. In many cases, the problem is related to an iOS glitch, a problematic app, insufficient storage, or battery issues. More serious cases may involve damaged internal components.

Here are some common reasons why an iPhone keeps restarting randomly:

• 01 iOS bugs or system glitches: Temporary system errors can cause unexpected shutdowns and restarts.
• 02 Outdated iOS: An older iOS version may contain bugs that affect system stability.
• 03 Problematic apps: A crashing or incompatible app can sometimes trigger random restarts.
• 04 Low storage space: When your iPhone has very little free storage, iOS may become unstable.
• 05 Battery problems: An aging or damaged battery may cause the iPhone to shut down and restart unexpectedly.
• 06 Overheating: Excessive heat can make the iPhone shut down temporarily to protect its internal components.
• 07 Hardware damage: Drops, water exposure, or damaged internal parts may also cause repeated restarts.

Once you understand the possible cause, you can try the solutions below to stop your iPhone from restarting randomly.

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How to Fix iPhone Randomly Restarts in 9 Ways

If your iPhone randomly restarts, start with simple checks such as battery health, problematic apps, storage space, and an iOS update. If the problem continues, you can move on to system repair or Recovery Mode. Try the following solutions in order to avoid unnecessary data loss.

Fix 1. Check iPhone Battery Health and Usage

A degraded battery can cause an iPhone to shut down or restart unexpectedly, especially on an older device. Instead of checking only which apps consume the most power, review both battery usage and battery health.

Go to Settings > Battery to review battery activity and see which apps are using the most power.

To check battery health:

• On iPhone 15 or later, go to Settings > Battery > Battery Health.
• On iPhone 14 or earlier, go to Settings > Battery > Battery Health & Charging.

If iOS indicates that the battery needs service or its maximum capacity has dropped significantly, battery replacement may be worth considering.

Fix 2. Update or Remove a Problematic App

If your iPhone starts restarting after you install, update, or open a specific app, that app may be involved.

• Step 1. First, open the App Store on your iPhone.
• Step 2. Tap your profile picture, select App Updates option.
• Step 3. Check whether an update is available for the affected app. If there is, tap the Update button. App updates often include compatibility fixes for newer versions of iOS.

If the problem continues, remove the app temporarily:

Go to Settings > General > iPhone Storage, select the app, and tap Delete App.

Restart your iPhone and use it normally for a while. If the random restarts stop, reinstall the latest version of the app and test it again.

Keep in mind that high battery usage alone does not necessarily mean an app is causing the restart.

Fix 3. Free Up iPhone Storage

Very low available storage can affect iOS performance and leave too little space for updates, temporary files, and normal system operations.

Go to: Settings > General > iPhone Storage

Check how much free space remains and review Apple's storage recommendations. You can remove unused apps, large videos, downloaded media, and other unnecessary files.

If you want to keep your photos and files, back them up to iCloud or another storage location before deleting them.

Fix 4. Force Restart Your iPhone

Lack of available RAM is also a cause of iPhone restarts randomly. When your iPhone has limited memory or RAM, if there is not enough available RAM to support your running apps at that point, it may cause the system to crash and thus cause your iPhone to reboot randomly. Please exit all applications you are using, including background apps, and force restart your iPhone to fix the problem.

• For iPhone 8 and later: Press and release the Volum Up button, press and release the Volume Down button, press and hold the Side button until the Apple logo appears the screen.
• For iPhone 7 series: Press and hold the Volum Down button, and press and hold the Power button until the Apple logo appears on the screen.
• For iPhone 6 and earlier: Press and hold the Home button, press and hold the Power button until the Apple logo appears on iPhone screen.

After your iPhone turns back on, use it normally and check whether the random restart problem occurs again.

Fix 5. Update Your iPhone to the Latest iOS

If your iPhone randomly restarts because of an iOS bug, installing the latest available software update may resolve it. Connect your iPhone to Wi-Fi and power before updating. It is also recommended to back up important data before installing a major iOS update.

Go to: Settings > General > Software Update section, if an update is available, tap Update Now button. Follow the on-screen instructions to update your iPhone to the latest version.

Fix 6. Reset All Settings

If updating iOS does not help, corrupted or conflicting system settings may be involved. Before erasing your entire iPhone, try Reset All Settings.

Go to: Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings

This resets system settings such as network, privacy, keyboard, display, and other preferences while keeping your photos, messages, apps, documents, and other personal data.

You will need to reconnect to Wi-Fi networks, pair Bluetooth devices again, and reconfigure some preferences afterward.

Fix 7. Fix iPhone Randomly Restarts with TunesKit iOS System Recovery

If the previous methods do not stop your iPhone from restarting, the issue may be related to a deeper iOS system error. Before erasing the device, you can try TunesKit iOS System Recovery. Compatible with the latest iOS version, TunesKit can repair more than 150 iOS/iPadOS issues, including iPhone won't turn on, iPhone stuck on the Apple logo, boot loops, and Recovery Mode problems. Its Standard Repair mode is designed to fix system issues while keeping your existing data.

The software works on both Windows and Mac and supports iPhone, iPad, and iPod touch, making it a practical option for troubleshooting software-related iOS problems.

Here's how to fix iPhone randomly restarts using TunesKit iOS System Recovery.

Step 1. Connect Your iPhone

Download and install TunesKit iOS System Recovery on your Windows PC or Mac. Connect the iPhone to the computer with a compatible USB cable. Launch TunesKit and choose iOS System Repair > Start.

Step 2. Choose Standard Repair

Select Standard Repair first. This mode is intended for common software-related iOS problems and is designed to preserve existing data. Use Deep Repair only when Standard Repair fails and you understand that Deep Repair will erase your data.

Step 3. Download Firmware Package

Check that the detected iPhone model and firmware information are correct, and click Download.

Step 4. Repair the iOS System

Once the firmware has been downloaded and verified, click Start Standard Repair. Keep your iPhone connected throughout the repair. When the process finishes, the device should restart. Use it normally for a while to see whether the random restarting problem has been resolved.

Fix 8. Update or Restore iPhone in Recovery Mode

If your iPhone still randomly restarts after trying the previous solutions, you can use Recovery Mode to reinstall iOS.

• Step 1. Connect the iPhone to your computer. Open Finder on a Mac or the Apple Devices app on a Windows PC. On older computers that do not support these options, you may still use iTunes.
• Step 2. Put the iPhone into Recovery Mode.
• Step 3. When your computer displays Update and Restore, choose Update first. This attempts to reinstall iOS without immediately erasing your personal data.
• Step 4. If Update fails and the problem continues, repeat the process and choose Restore as a last resort.
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Fix 9. Contact Apple Support

If your iPhone continues restarting after an iOS repair or full restore, the problem may be hardware-related. This is especially possible if the iPhone has been dropped, exposed to liquid, overheats frequently, has poor battery health, or restarts even after being set up as a new device.

In that case, contact Apple Support or an Apple Authorized Service Provider to have the internal hardware inspected.

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Conclusion

If your iPhone randomly restarts, try the basic fixes above first, such as checking the battery, freeing up storage, updating iOS, and force restarting. For software-related issues, TunesKit iOS System Recovery can help repair iOS without data loss using Standard Repair. If the problem continues, consider contacting Apple for hardware support.