iPhone Keeps Restarting? 9 Fixes That Work

If your iPhone keeps restarting over and over, the fix usually starts with a forced restart and a check of your battery health, then moves to updating iOS or restoring the device if the problem persists. This guide walks through the most common causes and the exact steps to try, from simple reboots to recovery mode, so you can stop the boot loop and get your phone stable again.

Why iPhones Get Stuck in a Restart Loop

An iPhone that restarts repeatedly—sometimes called a boot loop—happens when the system fails to load completely before powering down. The most frequent triggers are:

Software glitches after an iOS update or app install
Battery or hardware failure, especially if the phone is older or has been dropped
Storage completely full, preventing the system from writing necessary files
Overheating, which forces a shutdown to protect components
Water or physical damage that disrupts internal connections

In many cases, the issue is temporary and fixable at home. In others, it points to a hardware problem that needs professional service.

Start With a Forced Restart

A forced restart is different from a normal power-off. It clears temporary memory and can break a stuck boot loop. The steps depend on your iPhone model:

iPhone 8 or later (including all Face ID models): Press and quickly release the Volume Up button, then the Volume Down button, then press and hold the Side button until the Apple logo appears. Keep holding through the logo—do not release when you see it—until the home screen shows.
iPhone 7 / 7 Plus: Press and hold both the Side button and the Volume Down button simultaneously until the Apple logo appears.
iPhone 6s and earlier, and iPod touch with Home button: Press and hold both the Home button and the Top (or Side) button until the Apple logo appears.

If the phone restarts normally after this, you may be done. If it still loops, move on to the next steps.

Check Battery Health and Charging

A degraded or failing battery is one of the most common hardware reasons for random restarts. When the battery can’t deliver consistent power, the phone shuts down even with charge remaining.

To check battery health (if the phone stays on long enough): go to Settings → Battery → Battery Health & Charging. If it says “Service” or shows a maximum capacity below 80%, the battery may need replacement. Also try a different charger and cable—a faulty charger can cause power fluctuations that mimic a hardware fault.

If the phone only restarts when plugged in, the charging port or cable is likely the culprit. Try cleaning the port gently with a soft, dry toothbrush (no liquid) and using a different, preferably Apple-certified, cable.

Update iOS or Restore From Backup

Software bugs are often fixed by Apple in subsequent iOS releases. If your iPhone is stuck in a loop but occasionally boots, try updating:

Go to Settings → General → Software Update and install any available update.
If that doesn’t help, back up your data (if possible) and do a full restore via a computer.

To restore without losing data, use Finder (macOS Catalina or later) or iTunes (Windows or older macOS). Connect the phone, select it, and choose “Update” first—this reinstalls iOS without erasing your data. If that fails, you’ll need to “Restore,” which erases everything and installs a clean copy of iOS.

Use Recovery Mode as a Last Resort

When the iPhone won’t boot at all, Recovery Mode is the standard way to reinstall iOS. You’ll need a computer with Finder or iTunes.

Connect your iPhone to the computer.
Force restart your iPhone (using the same button sequence as above), but keep holding the buttons until you see the Recovery Mode screen—a computer icon and a cable.
On the computer, a dialog will appear offering “Update” or “Restore.” Choose Update first. It keeps your data and reinstalls iOS.
If Update fails or the loop continues, choose Restore to erase and reinstall. You’ll lose data, so only do this if you have a backup or accept the loss.

If Recovery Mode itself doesn’t work, your iPhone may be in DFU (Device Firmware Update) mode—a deeper restore that bypasses the boot loader. The button sequence varies by model, but it’s a more advanced step that often resolves stubborn software issues.

Free Up Storage and Check for Overheating

Two less obvious causes: storage and temperature.

Storage: If your iPhone is nearly full, it can’t write temporary files, leading to crashes. Delete large videos, offload unused apps, or clear Safari cache. You can check usage under Settings → General → iPhone Storage.

Overheating: If the phone feels hot, let it cool down for 30–60 minutes in a shady, cool place. Avoid using it while charging, and remove thick cases that trap heat. If it only restarts when hot, the battery or logic board may be failing.

When to Seek Professional Repair

If you’ve tried forced restart, updated/restored, and checked battery health, but the iPhone still loops, the problem is likely hardware. Common culprits include a swollen battery, damaged charging port, or a failing logic board. Apple and authorized service providers can run diagnostics. If your phone is under warranty or AppleCare+, this is the time to use it. If not, weigh the cost of repair against a replacement—especially for older models.

Frequently Asked Questions

Will I lose my data if my iPhone keeps restarting?

Not necessarily. A forced restart or an iOS update via Finder/iTunes preserves your data. Only a full “Restore” (which erases the device) will delete everything. Always back up regularly—iCloud or computer—so you’re prepared.

Why does my iPhone restart when I open a specific app?

That app may be buggy or incompatible with your iOS version. Try deleting the app and reinstalling it, or check for an update in the App Store. If the problem persists, the app might be causing a deeper system crash—consider contacting the developer or avoiding it until fixed.

Can a faulty charger cause my iPhone to restart repeatedly?

Yes. A damaged or non-certified charger can deliver unstable power, causing the phone to shut down or restart. Always use an Apple-certified (MFi) cable and a reputable power adapter. Try a different charger to rule this out.

What is the difference between Recovery Mode and DFU mode?

Recovery Mode reinstalls iOS while keeping your data (if you choose Update) or erasing it (Restore). DFU (Device Firmware Update) mode is a deeper restore that doesn’t load the boot loader—it’s used when Recovery Mode fails. DFU is more complex and should be done carefully, following exact button sequences for your model.

How long does a forced restart take to work?

A forced restart takes about 30 seconds to a minute. If the phone boots to the home screen and stays there, the problem was likely a temporary glitch. If it restarts again within a few minutes, you’ll need to try other fixes.

General steps for current mainstream versions; menus can differ by device and version. See the disclaimer or report an error.

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