My Samsung Galaxy A40 that shuts down randomly. Here’s the fix.

When a smartphone like the Samsung Galaxy A40 shuts down by itself often, the problem could be due to a firmware issue, or it could be a sign that the battery has already been damaged. It is necessary to perform some troubleshooting procedures to know the reason why this problem occurs, and that you will have a shot at fixing it as early as possible. 

So, in this post, I will be walking you through in fixing your Galaxy A40 that shuts down randomly for some reason. We will try to determine the reason why it happens because that’s the best way to fix this problem. If you’re an owner with a problem like this, continue reading because this article may be able to help you. 

For those who are looking for a solution to a different problem, drop by our troubleshooting page for we have already addressed some of the most common issues with this phone. Browse through the page to find issues that are similar to yours and use the solutions we suggested. If they don’t work for you or if you still need our help, contact us anytime through our Android issues questionnaire.

Troubleshooting Galaxy A40 that randomly shuts down

In troubleshooting your phone that turns off by itself without apparent reason, you need to be thorough. If it’s just an issue with the firmware, then you can make your phone work perfectly again after reading this article and following the simple solutions I present here. However, if it’s a hardware problem, then there’s only so much you can do about especially if you still care about  your phone’s warranty. Probably, the best thing you can do about it is to bring the device back to the store so that a technician can check it for you. 

But assuming that your phone doesn’t have any signs of physical or liquid damage, here are the things you can do about this problem…

First solution: Connect your phone to the charger

We need to know how your phone works if it’s connected to a steady power source, that’s the reason why we need to connect it to the charger. For this, we’re trying to rule out the possibility that the battery of your device is already failing. 

So, plug the charger to a working wall outlet and then using the original cable, connect your phone to its charger. While it’s charging, use it like you always do to see if it still shuts down on its own. If it still does, then it’s probably a firmware issue that’s causing it. So, proceed to the next procedure. However, if it doesn’t turn off, then the problem could be hardware-related but continue your troubleshooting. 

Second solution: Run your phone in Safe Mode

Now, we need to know if this problem is caused by some third-party applications that’s the reason why you need to run your phone in safe mode. Because in doing so, you’re temporarily disabling all third-party apps. If the random shutdowns don’t occur in this mode, then it confirms our suspicion. So, follow these steps to run your phone in safe mode: 

  1. Press and hold the Power key until options show. 
  2. Tap and hold the Power off option until it changes into Safe Mode. 
  3. Tap the Safe mode icon to restart your device.
  4. Once the reboot is successful, you should see ‘Safe mode’ at the lower-left corner of the screen. 

You should still be able to continue using your phone while in this mode, so try to see if it still shuts down on its own. If the problem doesn’t occur and your Galaxy A40 actually works properly while in safe mode, then it means that a third-party app is causing the problem. To probe further, follow these steps: 

  1. Restart your phone normal to boot into standard mode. 
  2. Remember the apps you installed about the time when the phone starts to shut down by itself. 
  3. Once you already have an app in mind, swipe down from the top of the screen to pull the notification panel down. 
  4. Tap the Settings icon on the upper-right corner. 
  5. Scroll to and then tap Apps. 
  6. Find and tap suspected app. 
  7. Tap Storage. 
  8. Touch Clear data and tap OK to confirm.
  9. Tap the back key once and then touch Uninstall. 
  10. Confirm that you want to remove the app from your phone. 

On the other hand, if your phone still turns off even in safe mode, then it’s time to troubleshoot the firmware. Move on to the next solution. 

Third solution: Wipe the cache partition

There are times when the system cache gets corrupted and when that happens, performance issues may occur and that could be the reason why your phone is shutting down by itself for no apparent reason or cause. If the problem isn’t fixed by doing the first two procedures, then you have to wipe the cache partition to delete the old cache and gets replaced with a new one. Here’s how…

  1. Turn off the device.
  2. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  3. When the Galaxy A40 logo shows, release all three keys.
  4. Your Galaxy A40 will continue to boot up into the Recovery Mode. Once you see a black screen with blue and yellow texts, proceed to the next step. 
  5. Press the Volume down key several times to highlight wipe cache partition.
  6. Press Power key to select.
  7. Press the Volume down key to highlight yes, them and press the Power key to select.
  8. When the wipe cache partition is complete, Reboot system now is highlighted.
  9. Press the Power key to restart the device.

Once your Galaxy A40 has successfully rebooted, try to observe closely to see if it still shuts down by itself. If it still does, then try the next solution. 

Fourth solution: Backup your files and reset your phone

If your phone doesn’t have any signs of physical or liquid damage and provided that the firmware hasn’t been modified in any way, then you will be able to fix this problem by doing the master reset. However, before that, make sure to create a copy of your important files and data as they will be deleted. After that, remove your Google and Samsung accounts so that you won’t be locked out and then follow these steps to reset your phone: 

  1. Turn off the device.
  2. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  3. When the Galaxy A40 logo shows, release all three keys.
  4. Your Galaxy A40 will continue to boot up into the Recovery Mode. Once you see a black screen with blue and yellow texts, proceed to the next step. 
  5. Press the Volume down key several times to highlight ‘wipe data / factory reset’.
  6. Press Power button to select.
  7. Press the Volume down key until ‘Yes’ is highlighted.
  8. Press Power button to select and start the master reset.
  9. When the master reset is complete, ‘Reboot system now’ is highlighted.
  10. Press the Power key to restart the device.

After the reset, set up your phone as a new device and don’t install anything yet. Instead, observe closely to know if it still shuts down on its own. If it still does, then it’s time you brought it to the Samsung Experience store and have the tech check on it. 

I hope that we’ve been able to help you fix your Galaxy A40 that randomly shuts down. We would appreciate it if you helped us spread the word so please share this post if you found it helpful. Thank you so much for reading!

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