Why Did My iPhone Randomly Restart? Here Are The Reasons Why and Fixes

  1. Published on Dec 17, 2021
  2. Updated on Dec 17, 2021
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Your iPhone could be experiencing what may experts call a boot loop. This is when your device randomly restarts with no input from you.

While this problem is more common in older devices that may have memory issues, it has also been reported in new devices.

If your iPhone is randomly restarting and you’re looking for the right fix, we’ve come up with a number of solutions that can be very helpful.

But before we get to the solutions, let’s first find out why your iPhone is randomly restarting.

Why Your iPhone Might Restart Randomly

This problem is often caused by a hardware or software issue. You will know that a hardware issue is to blame if you recently dropped the iPhone and the impact caused damage to one or more of the hardware components.

Even if you don’t see obvious signs of damage such as a broken device, circuitry components on the inside may be damaged. The same is true if the device suffered liquid damage.

If you did not drop the device and you are certain there is no damage to any of the hardware components, then you are likely dealing with a software issue.

Glitches in the device’s firmware and software have been known to cause various issues with the device, including a device that randomly restarts.

Your iPhone may also randomly restart if you recently installed a new app that is malfunctioning.

Most apps in the App Store are thoroughly vetted to avoid these problems, so you may likely experience this issue if the app was installed from other sources.

This is also a common problem that user experience when they jailbreak their devices, primarily because a jailbroken device can access apps from sources other than the App Store.

Jailbreaking your iPhone will also significantly alter the software makeup of the device and while it may give you access to features and apps you may not normally use, it can also cause massive issues with the software, causing problems like this one.

Must-Try Fixes to iPhone Randomly Restart Issue

The following are the most effective solutions you can try if your iPhone is randomly restarting. We will primarily deal with software-related solutions since software malfunctions are the most common cause of the problem:

Find and Eliminate Bad Apps

Since these random restarts can be caused by malfunctioning apps, the best place to start is to find and eliminate these apps.

Start by determining the apps that are draining the device’s battery unnecessarily. Fortunately, this is very easy to do: just use these steps:

  • Step 1: If you can access the home screen, open Settings.
  • Step 2: Tap on “Battery” and then select “Show Activity.”
  • Step 3: Tap on “Show Detailed Usage” and you should see the on-screen and background activity of all the apps and features on your device.
  • Step 4: To determine the apps that are taking up too much of your battery, tap “Battery Usage.” You will be able to see battery consumption details in the last 24 hours or 10 days.

Once you have determined the apps that are draining your battery, you can choose to either update or delete them completely.

Find and Eliminate Bad Apps

You can update the apps from the App Store or follow these steps to delete them from your iPhone:

  • Step 1: Go to the Home Screen, tap and hold on the app icon until it starts to wiggle.
  • Step 2: Tap on the “X” in the top-left corner of the app.
  • Step 3: Tap “Delete” to confirm that you want to delete the app.

Repeat the steps with all the apps you would like to delete. If you would still like to use the apps you have deleted, you can reinstall them from the App Store.

delete apps from your iPhone

But we recommend waiting until the problem has been resolved permanently before reinstalling the apps.

Update the Apps and iOS for Your iPhone

Outdated apps and an outdated iOS can also cause a myriad of problems including a random restart.

Updating the apps on your iPhone as well as the version of iOS running on your device can therefore resolve this problem.

If you have not enabled auto-updates, you can manually check for available app update using these steps:

  • Step 1: Open the App Store from the home screen.
  • Step 2: Scroll down and tap on “Updates.” You should see a list of the apps on the device that need to updated.
  • Step 3: You can then tap on “Update” next to the individual app that you want to update or you can tap on “Update All” at the top-right to update all apps at the same time.

Updating the apps on your iPhone

Once all apps are updated, you may want to take this a step further by updating the version of iOS on the device.

If available, an iOS update will often come with bug fixes that are aimed at fixing problems like this one.

To update the iOS, go to Settings > General > Software Update. If an update is available, select “Download and Install” to initiate the update process.

updating the version of iOS

If for some reason you are unable to update the iOS from the settings, you can connect the iPhone to the computer and update it via iTunes.

Manage Your iPhone Storage

Lack of adequate memory can also cause the iPhone to randomly restart. In this case, you may want to check the storage situation on your device.

Often times, you will find that there are a lot of apps and data that are no longer useful on the device such as old messages and some unwanted files.

To check the storage on the device, go to Settings > iPhone Storage and find the apps that you would like to remove.

If you would like to delete old messages, open the Messages app, select the message threads that no longer serve you and delete them.

 iPhone storage

Reset All Settings on iPhone

Resetting all the settings on your iPhone has also been proven to be a good way to fix this problem. This is because it can remove some of the conflicting settings that may be causing the problem in the first place.

To reset all the settings, open the Settings app and then tap “General.” Scroll down to tap “Reset” and in the options that appear, select “Reset All Settings.”

When prompted to confirm your selection, tap “Reset” again and in a few seconds your device will restart hopefully with the boot loop issue resolved.

reset menu

Apply TinyFix iOS System Repair Tool

TinyFix is software that can be used to resolve the most common iOS system issues, including a device that keeps restarting.

It is highly effective because it resolves the underlying cause of the problem, thereby fixing the device once and for all.

Because it repairs the iOS directly, it is also the best solution for all other iOS stuck problems, making it a great investment for any iOS device user who may experience one or more of these issues during the life of the device.

It will also fix the device without causing data loss and is very easy to use: just follow these steps to use TinyFix to repair the device:

  • Step 1: Download TinyFix on to your computer. Install it, launch it after installation and then connect the iPhone to the computer.
  • Step 2: When the program detects the connected device, click on “iOS System Repair”>“Standard Mode.”
  • Step 3: In the next window, you will be asked to download the latest firmware for the device. Just click “Download” to start the download.
  • Step 4: When you have the firmware, click “Fix Now” and TinyFix will begin repairing the software. The device will restart as soon as the repair process is complete.

 main screen of TinyFix

Factory Reset Your iPhone

A factory reset or a master reset is a good solution especially if this issue continues to become persistent.

This is because it will erase all the data and settings on your device, therefore wiping the device completely including the removal of any corrupt data or settings that may be causing the device to malfunction.

But before we show you how to factory reset your iPhone, keep in mind that you will lose all data on your device.

So, you may want to ensure you have a latest backup of all your data that you can restore later. That said, here’s how to factory reset your iPhone:

  • Step 1: Open the Settings from the Home screen.
  • Step 2: Select “General” and then scroll down to choose “Reset.”
  • Step 3: From the options presented, choose “Erase All Content and Settings” and then enter your passcode when prompted.
  • Step 4: Tap “Reset” to confirm and the process will begin. The iPhone will restart in the setup screen and you can follow the prompts to set up the iPhone and restore data from your backup.

Factory Reset Your iPhone

Restore Your iPhone

If the problem persists, then you are likely dealing with fatal system errors that are much harder to get rid of. Your only option is to put the iPhone in recovery mode and restore it in iTunes.

If recovery mode doesn’t work, then you can put the device in DFU mode and restore it. But before taking the steps to put the device in recovery mode or DFU mode, we recommend attempting a regular restore.

Here’s how to restore your iPhone in iTunes:

  • Step 1: Open iTunes in your computer and make sure that you are using the latest version.
  • Step 2: Use the device’s USB or lightning cable to connect the iPhone to the computer.
  • Step 3: Enter the passcode when your device prompts you or “Trust this Computer” to ensure that iTunes will detect the connected device.
  • Step 4: Select the iPhone when it appears in iTunes and in the “Summary” section, choose “Restore [iPhone].
  • Step 5: Click on “Restore” to confirm and keep the iPhone connected to the computer until the restore process is complete.

restore iPhone

If iTunes is unable to detect the device or a regular restore doesn’t work, you should put your device in recovery mode before restoring it. If recovery mode doesn’t work, try restoring the device in DFU mode.

Wrapping Up

We hope the solutions above have been able to help you fix the device. They are predominantly to help resolve software issues, so if you think that your iPhone has suffered hardware damage, they may not help.

In the case of hardware damage, we recommend contacting Apple Support for further assistance. At the Apple Store technicians will be able to help resolve any hardware problems.

Aaron Roussey

Aaron is tech-savvy and enjoys writing technical articles about phones, computers, games, and the internet!
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