Mr Fix’s Step-by-Step Guide on How to Fix an iPhone That Keeps Shutting Off

February 24, 2026

It can be annoying when your iPhone keeps shutting off without warning. It stops your calls, deletes unsaved work, and can even cause you to lose data or use up a lot of battery life. This strange behavior can make your gadget unreliable and disrupt your daily life, making you feel helpless. The good news is that a lot of these problems can be found and fixed with some simple troubleshooting.

If your iPhone keeps shutting down, this complete guide will show you the most common reasons why and provide you with step-by-step instructions on how to fix them so you can get your phone back on track. And if the problem keeps happening, Mr Fix is ready to help with quick, dependable, and experienced iPhone repair and diagnostic services that will put your mind at ease.

What to Do When Your iPhone Keeps Shutting Off

Before you start looking for remedies, it’s a good idea to know why your iPhone is behaving up. Random shutdowns can happen for several reasons, from basic software bugs to more serious hardware problems.

Battery degradation is one of the most typical problems. As lithium-ion batteries get older, they lose their ability to hold a charge. Suppose your battery has more than 500 cycles or its maximum capacity is significantly reduced. In that case, it may not be able to provide the power you need, especially when you need it the most, which could cause it to shut down suddenly.

Problems with software or bugs in iOS: Corrupted system files, old versions of iOS, or specific vulnerabilities in the operating system might make it unstable and cause it to restart without warning.

Problems with overheating: Using your iPhone for a long time, such as playing games for a long time, streaming a lot of video, or using it in bright sunlight, might make it overheat. Your iPhone may shut down as a safety step to prevent damage to its internal components.

Apps that don’t work right or malware: A poorly written app, a rogue background process, or even malware can use too many resources, causing crashes and shutdowns.

Damage to the internal hardware: More significant concerns include loose internal connections, a broken power IC (integrated circuit), or difficulties with the motherboard itself. A professional needs to look at these and fix them.

Overloaded storage or corrupted system files: If your iPhone’s storage is almost full or essential system files get corrupted, it can cause problems with performance and abrupt shutdowns.

How to Fix an iPhone That Randomly Shuts Off: A Step-by-Step Guide

This is a practical, step-by-step instruction that will help you fix your iPhone’s random shutdown issue.

Step 1: Check the health of the battery and do a hard reset.

The battery is usually the first thing to check.

Check the health of the battery: To check the health and charging of your battery, go to Settings > Battery > Battery Health & Charging. If your Maximum Capacity is much lower than 80% or you get a notification saying “Service,” your battery is probably worn out, and you should get a new one.

Do a hard reset: This can fix minor software problems by forcing your iPhone to restart and clean off its temporary memory.

For the iPhone 8 and later, including the X, 11, 12, 13, 14, and 15 series: Press and hold the Volume Up button for a second. Press and hold the Volume Down button for a second. After that, hold down the Side button (the power button) until the Apple logo appears.

For the iPhone 7 and 7 Plus, press and hold the Volume Down and Sleep/Wake buttons at the same time until you see the Apple logo.

For iPhone 6s/6s Plus and earlier: Press and hold the Home and Sleep/Wake buttons at the same time until the Apple logo appears.

Step 2: Restore or update iOS

It’s essential to keep your iOS up to date for stability.

Update iOS: To install any available updates, go to Settings > General > Software Update. Apple periodically distributes updates that repair flaws and make the system more stable.

Do a DFU Restore: If the problem doesn’t go away after updating, a Device Firmware Update (DFU) restore is a more thorough fix that reloads the iPhone’s firmware and operating system. This should be the final thing you do before getting aid from a professional, since it deletes all your data.

Use a Lightning or USB-C connector to connect your iPhone to a Mac or PC.

Set your iPhone to DFU mode. The methods are different for each model, but they usually include pressing certain buttons when the device is linked to the computer. You can find detailed instructions by searching for “DFU mode [your iPhone model].”

When your computer is in DFU mode, it will find an iPhone that is in recovery mode. To restore your device, use iTunes (on Windows or previous versions of macOS) or Finder (on macOS Catalina and later). This will restore the most recent version of iOS, which should fix any serious software problems.

Step 3: Get rid of broken apps and make room on your device.

Apps that don’t work right and storage that is too full might make things unstable.

Check for Available Storage: To find out how much space is left, go to Settings > General > iPhone Storage. To get the best performance, try to maintain at least 10–15% of your storage free.

Remove Files and Apps That You Don’t Need: Take out big videos, old images, and especially any programs you just installed around the time the shutdowns started.

Clear the App Cache: Even though iOS doesn’t have a direct “clear cache” button for all apps, you can usually clean their data by offloading or deleting and reinstalling them. You may also clear the cache in the settings of several apps. After making room, restart your device.

Step 4: Keep Your iPhone Cool and Don’t Let It Overheat

Electronics don’t like heat very much.

If your device gets hot after it turns off, let it cool down fully before you try to use it again.

Stay away from things that make you too hot: While your iPhone is charging, don’t leave it in bright sunlight, in a hot car, or use it for long periods (such as gaming or streaming video), especially if it’s already warm.

If your phone becomes hot a lot, even when you’re just using it normally, it could be a problem with the cooling system’s hardware that needs to be looked at by a specialist.

Step 5: Do a diagnostic test or get a professional to fix it.

It might be necessary to check more closely if the methods above don’t fix the problem.

Use the built-in diagnostics on your Apple device: You can try dialing *#06# on your iPhone, but it’s not a complete diagnostic. This usually shows your IMEI number, although some carriers or areas may have diagnostic codes that aren’t visible. Connecting to official Apple diagnostic equipment at approved service locations like Mr Fix is the best way to do a more thorough test.

When to Ask for Professional Help

Sometimes, no amount of troubleshooting will help. If your iPhone keeps shutting off for no reason after you’ve tried all of the above techniques, you need to take it to a professional for diagnosis and repairs. If you try to address complicated hardware problems yourself, you could make them worse.

Some problems that nearly always need professional repair are:

Battery Replacement: If your battery is very worn out or has started to swell (which can be harmful), you need to have a professional replace it.

Problems with the motherboard: Micro-soldering and replacing components on the logic board can be complex if there are problems with the power IC or other parts.

Broken Buttons: If the power or volume buttons are broken, they could cause the device to restart unexpectedly or malfunction.

Corruption of software or failures of the system: If your iOS is severely damaged and a DFU restore can’t fix it, you may need more advanced software tools.

Problems with Internal Cooling Solutions: If your iPhone often becomes too hot even when you’re using it normally, there may be a problem with its internal thermal management system.

Why should you choose Mr Fix to fix your iPhone?

You need a repair provider you can trust when your iPhone isn’t working right. Here’s what makes Mr Fix stand out:

Certified Technicians: Our staff is made up of highly qualified and certified technicians who can find and fix a wide range of iPhone problems, including complex issues with the battery, software, or hardware. We keep up with the newest Apple technologies and ways to fix things.

State-of-the-Art Tools: We use the most advanced, professional tools to examine and fix every part of an iPhone with accuracy. This makes sure that the diagnostics are correct and the fixes last a long time.

Quick Service: We know you use your iPhone every day. That’s why we complete most typical repairs on the same day or the following day, so you don’t have to wait long.

Conclusion

It can be annoying when your iPhone keeps turning off for no reason, but if you carefully troubleshoot the most common problems, you can typically find the source of the issue. These methods often fix minor problems, like monitoring the health of your battery, updating your iOS, managing storage, and preventing overheating.

If your iPhone keeps shutting down for no reason, though, even after you’ve tried everything you can think of, it’s a clear sign that you need professional help. Don’t allow a broken gadget to slow you down or put your data at risk. Mr Fix is the best place to go for experienced iPhone repair, battery replacement, and software recovery services. You can trust them to fix your device right.

Is your iPhone still acting up? Go to Mr Fix today for a complete diagnosis!