How to Fix an iPhone that Keeps Restarting on its Own – The Cell Guide

To fix an iPhone that keeps restarting on its own without apparent reason or cause, update the phone’s operating system. Hence, basic workarounds can also be applied to fix firmware issues like random reboots.

Firmware issues occur from time to time and while they may seem like a serious problem, they’re actually just so easy to fix. This post highlights some recommended solutions and workarounds to deal with this issue. Keep reading for more info.

Before anything else, if you are looking for a solution to a different problem, then drop in on our iPhone Help Guides page for we have already solved some of the most common problems with this device. Try to find issues that are similar with yours and feel free to use our workarounds and solutions.

Troubleshooting iPhone that keeps restarting on its own

Before troubleshooting, try to remove and reset the SIM card on your iPhone. I’ve experienced the same problem before with my iPhone 5 that’s suddenly restarting on its own. And it turned out that a dislodged SIM card on the card tray was the underlying cause of the problem. To make sure that this isn’t what’s causing the same trouble, remove and reset the SIM card. You will need to use a SIM ejector tool to unlock and pop the SIM card tray out from the phone. If you don’t have a SIM ejector, then you can use a small bent paper clip as alternative. Once you have the tool ready, turn off your iPhone. While the phone is turned off, insert the ejector tool into the small hole on the SIM card tray. The SIM card tray is located on the side of the phone. Gently push the SIM ejector until the tray ejects. Slowly pull the tray out from the phone and then remove the SIM card from its slot. Then place the SIM card back into the tray in the same orientation before you removed it. Be sure to secure the SIM card in place before pushing the SIM card tray back into the phone. Once the SIM card tray is locked back in place, turn your iPhone on and use it as you normally do to see how it works.

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If the iPhone still restarts on its own, you may go ahead and rule out software-related factors with these methods.

First solution: Force restart

Your iPhone that keeps restarting on its own is usually because something must have triggered it to reboot intermittently or to get stuck on random restart. If it’s not a hardware issue, then software-related factors should be at fault. Oftentimes, bad apps are the main triggers and therefore the emerging symptom is minor. To deal with minor software issues like this, forcing the iPhone to restart would usually suffice. Thus you may consider this as the very first option to try. In new iPhone, a forced restart is carried out this way:

  1. Press and release the Volume Up button.
  2. Then press and release the Volume Down button.
  3. Finally, press and hold the Side button and then release it when the Apple logo appears.

These steps are applicable to iPhone 8 and later models. In early iPhone like the iPhone 7 and iPhone 7 Plus, here’s how a forced restart is done:

  • Press and hold the Volume Down button and the Power (Sleep/Wake) button simultaneously and then release both buttons with the Apple logo appears.

Earlier versions of iPhones like the iPhone 6s, 6s Plus, 6, SE and 5s are forced restart with these procedures:

  • Press and hold both the Power (Sleep/Wake) button and the Home button for a few seconds and then release both buttons when the Apple logo is displayed on the screen.

Allow the phone to finish rebooting and then see how it works. If it continues to restart on its own, then you can proceed to the next possible solutions.

ALSO READ: How to recover deleted voicemails on your Apple iPhone XS Max

Second solution: Update your apps to fix iPhone that keeps restarting

Rogue apps that caused the device to restart on its own can also be remedied by installing updates. App updates usually embed patches to fix bug inflicted symptoms that caused app irregularities. If your iPhone can connect to the Internet, then try performing these steps to manually install pending app updates through the App Store:

  1. Open the App Store.
  2. Scroll down to the bottom of the App Store screen then tap on Updates.
  3. Tap the Update button next to the name of the application to update.
  4. Otherwise, tap the Update All button to install all app updates at once.

If iPhone keeps restarting, reboot the phone after updating all apps to save the recent software changes and to refresh the operating system. See if that fixes your iPhone that keeps restarting.

Third solution: Install iOS update, if available

Aside from app updates, installing the latest iOS version available for your iPhone can also be the key to resolving the issue especially if system bugs are to blame. Like app updates, iOS updates also offer bug fixes to address various issues on the receiving devices. To check for iOS updates, connect your iPhone to Wi-Fi internet and then proceed to these steps:

  1. Go to the Home screen then tap on Settings.
  2. Tap General.
  3. Select Software Update.

If a new update is available, you should see a notification. Read and review the update details then tap the option to Download and Install when you’re all set.

After updating, reboot your phone to apply the recent system changes and to refresh your apps and operating system. If your iPhone keeps restarting even after this, then move on to the next solution.

Fourth solution: Manage your iPhone storage

The problem can also be due to memory problems like when the device is running low on storage. For memory-related issues depicted by random restarts, freeing up storage space is usually the key towards a resolution. That said, delete all unwanted apps and old files from your device.

  • To delete/uninstall apps from your iPhone, simply head over to the Home screen then touch and hold on the app icon for a few seconds or until the icons wiggle. Then tap on the X found on the upper-left side of the app that you want to remove. If prompted, tap Delete to confirm action.
  • Alternatively, you can access your phone storage by heading to Settings-> General-> iPhone Storage menu.

You can also delete old messages, photos, audio and video files that are no longer used on your phone. Try to see if your iPhone keeps restarting still after this and if it does, try the next procedure.

ALSO READ: How to fix an Apple iPhone XS Max that got stuck on black screen

Fifth solution: Reset all settings to fix iPhone that keeps restarting

Incorrect settings from auto-update overrides or manual customization are also among the possible triggers. To rule these out, resetting all settings on the iPhone is recommended. This reset does not affect saved data on the internal memory but will erase recent customization and modified settings on the phone. Here’s how it’s done:

  1. From the Home screen, tap on Settings.
  2. Tap General.
  3. Scroll down to and tap on Reset.
  4. Choose the option to Reset all settings.
  5. Enter your device pass code when asked to continue.
  6. Confirm that you want to reset all settings on your iPhone.

When the reset is finished, the phone reboots automatically and then loads up the default values. To use the features that are disabled by default, you will need to re-enable them first. If this doesn’t fix your iPhone that keeps restarting, try the next solution.

Last resort: Erase then restore your iPhone

The problem may be a little too complex that it required more advanced solutions. At this point, your next option would be a factory reset or master reset on the iPhone. This reset wipes everything from your iPhone system including tough bugs and malwares that caused stubborn symptoms. But before you proceed, be sure to back up all your important files to i Cloud or iTunes so you can still recover them later. Then you may proceed with these steps to factory reset your iPhone through its settings menu:

  1. Tap Settings from the Home screen.
  2. Tap General.
  3. Scroll down and tap Reset.
  4. Select the option to Erase all content and settings.
  5. Type in your pass code to proceed.
  6. Then confirm that you want to erase and restore your iPhone to its factory defaults.

After the reset, the phone should reboot and then loads up its factory defaults. To use your phone again, use the start-up wizard to set it up as new.

Software-related issues that are attributed to complex system errors are remedied through a factory reset but if the problem continues after doing so, restoring iOS in recovery mode can be considered as the next potential solution.

To get started with recovery mode restore, connect your iPhone to the computer using the supplied USB/Lightning cable. You can use either a Mac or Windows computer for as long as it has the latest version of iTunes. When it’s connected, enter recovery mode using the following procedures.

If you’ve got an iPhone 8 or later variant, here’s how to enter in recovery mode:

  1. Press and quickly release the Volume Up button.
  2. Then press and quickly release the Volume Down button.
  3. Finally, press and hold the Side button until the Recovery Mode screen appears.

To enter recovery mode in earlier iPhones like the iPhone 7 and 7 Plus, refer to these steps:

  • Press and hold the Side/Power button and Volume Down button simultaneously and then release both buttons when the Recovery Mode screen shows up.

For iPhone 6s, 6s Plus, and earlier models, you can enter recovery mode with these steps:

  • Press and hold both the Home button and Top/Power buttons simultaneously and then release both buttons when the Recovery Mode screen appears.

Note: Do not release the Side/Power button if you see the Apple logo because you still have to wait until the device enters recovery mode.

  • When you see the option in iTunes to Update or Restore, select Update if you want to restore without deleting files.
  • To restore your iPhone from a previous iOS backup, click the option to Restore then follow the onscreen instructions to select the backup that you want to restore from.

Allow your device to finish restoring then reboot it when done : 

Other options

If the problem continues after applying the above solutions, then your next option would be to use non-Apple iOS repair tools or get your iPhone repaired by an Apple technician.

Use iTunes alternatives

Should the problem on random restarts is caused by major system flaws like major firmware crashes or system data corruption that could not be rectified in iTunes, resorting to alternative iOS repair and recovery tools can be considered an option. These tools can be downloaded and installed on a compatible computer either Windows or Mac just like iTunes. Once the software is installed, connect your iPhone to the computer via USB cable then launch the software and start repairing your iPhone’s flawed system. Just click on the appropriate command button or control to repair and restore your iPhone.

Service or iPhone repair

If all else fails, then that’s when you should consider opting for service. Your iPhone might have obtained hardware damage from previous incidents of dropping or liquid exposure. In that case, take your device to the nearest Apple-authorized service center in your area and have it scrutinized by an iPhone technician.

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