iPhone Randomly Restarts After iOS 12? Fix

If your iPhone randomly restarts after installing iOS 12, the most common fix is to update to a newer iOS version, as Apple released several updates to address reboot bugs. If you are already on the latest version, the next steps are to check for app conflicts, reset settings, or restore the device from a backup.

Why iOS 12 Caused Random Restarts

iOS 12 was released in September 2018, and shortly after, some users began reporting that their iPhones would randomly restart or show the Apple logo and then reboot. This issue was often traced to a few underlying causes:

• Software bugs in the initial iOS 12 release, particularly related to memory management and background processes.
• Incompatible apps that were not yet updated for iOS 12, causing crashes that triggered a restart.
• Corrupted settings or cached data left over from a previous iOS version.
• Battery health problems that became more apparent after the update, especially on older iPhones.

Apple acknowledged some of these issues and addressed them in subsequent updates like iOS 12.0.1 and iOS 12.1. Therefore, the first and most important step is to make sure your iPhone is running the latest version of iOS.

Step-by-Step Fixes to Stop Random Restarts

Follow these steps in order, testing after each one to see if the problem is resolved. Start with the simplest and least invasive.

1. Update iOS – Go to Settings > General > Software Update. If an update is available, download and install it. This is the most likely fix if you are still on an early iOS 12 version.
2. Update all your apps – Open the App Store, tap your profile icon, and update all pending apps. Developers release updates to fix compatibility issues with new iOS versions.
3. Restart your iPhone normally – Press and hold the power button (and volume button on Face ID models) until the slider appears, then slide to power off. Wait 30 seconds, then power it back on.
4. Reset all settings – Go to Settings > General  Reset > Reset All Settings. This does not erase your data, but it resets Wi-Fi passwords, wallpapers, and other system settings. It can clear corrupted settings that cause reboots.
5. Restore from a backup – If the problem persists, back up your iPhone, then restore it using a computer (Finder or iTunes). You can choose to restore from the backup you just made. If the issue continues, try setting up as a new iPhone (without restoring) to see if the problem is caused by a backup.

Common App-Related Causes

Sometimes a specific app is the culprit. Apps that are poorly optimized or that use a lot of memory can crash the system, causing a restart. To identify if an app is causing the issue:

• Note which apps you are using when the restart happens.
• Delete that app temporarily and see if the restarts stop.
• Check for app updates in the App Store.
• If you suspect a background app, force-close all apps by swiping up from the bottom (or double-clicking the home button on older models) and swiping apps away.

In many cases, simply updating the problematic app resolves the issue.

Battery Health and Hardware Issues

An aging battery can cause unexpected shutdowns and restarts, especially if the iPhone is under heavy load. To check your battery health:

1. Go to Settings > Battery > Battery Health.
2. If the maximum capacity is below 80% or the phone shows a “significant performance management” message, the battery may need to be replaced.
3. If the phone is very hot or the restart happens only when using demanding apps, a hardware issue could be the cause. In that case, contact Apple Support or visit an authorized service provider.

Note that iOS 12 introduced a feature that throttles performance on iPhones with degraded batteries to prevent unexpected shutdowns. This can make the phone feel slower, but it should reduce random restarts.

What to Do If the Problem Persists

If you have tried all the steps above and the iPhone still randomly restarts, there are a few more advanced options:

• Erase and set up as new – This is the most thorough software fix. Back up your data, then go to Settings > General > Reset > Erase All Content and Settings. Set up as a new iPhone without restoring any backup. If the problem stops, it was likely caused by corrupted data or an app in your backup.
• Restore via a computer – Connect your iPhone to a computer, put it in recovery mode, and restore the firmware. This reinstalls iOS completely. You can find instructions on Apple’s support website.
• Check for hardware damage – If the phone has been dropped or exposed to water, internal damage could be the cause. Professional diagnostics are needed.

Preventing Future Restarts

Once you have fixed the issue, you can take some precautions to avoid it happening again:

• Keep iOS and apps up to date.
• Regularly restart your iPhone (once a week is a good habit).
• Monitor your storage – if the phone is nearly full, it can cause performance issues. Keep at least 10% of storage free.
• Be careful with beta versions of iOS – they are more likely to have bugs.

Frequently Asked Questions

Will I lose my data if I reset all settings?

No, resetting all settings does not delete your personal data like photos, contacts, or apps. It only resets system settings such as Wi-Fi passwords, Bluetooth connections, and notification preferences. You will need to re-enter Wi-Fi passwords and adjust some settings afterward.

How do I know if the problem is caused by a specific app?

If the restart happens only when you are using a particular app, that app is likely the cause. Try deleting that app and using your phone normally for a day or two. If the restarts stop, the app was the problem. You can then reinstall it (checking for updates) or contact the app developer.

Can a jailbreak cause random restarts?

Yes, jailbreaking can make your iPhone unstable and cause random restarts, especially if you install tweaks that interfere with system processes. If you have a jailbroken device, restoring it to a non-jailbroken state (via a computer restore) is the recommended fix.

My iPhone restarts only when it’s charging. What could be wrong?

This could be related to a faulty charging cable, adapter, or the charging port. Try using a different Apple-certified cable and adapter. If the problem persists, the battery or the charging port may need service.

Should I downgrade from iOS 12 to iOS 11 to fix the problem?

Apple stops signing older iOS versions shortly after a new release, so downgrading is usually not possible. Even if it were, iOS 11 is older and has its own security vulnerabilities. It is better to update to the latest iOS 12 version or the newest iOS available for your device.

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