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How to fix your Samsung Galaxy J3 that keeps restarting / rebooting [Troubleshooting Guide]

Samsung Galaxy J3 owners have been reaching out to us seeking assistance in determining what causes the phone to restart by itself. We may have addressed this issue before but we have to help our readers who are bugged by this problem.

Some of those owners recently updated their phones while others said the problem started without any apparent reason or cause. Whatever the case maybe, it’s certain that this problem is firmware-related unless of course, the phone suffered from either physical or liquid damage prior to this problem.

We will be suggesting things you can do with your Galaxy J3 that keeps rebooting on its own. We don’t suggest things that can potentially damage your device even more so rest assured that our troubleshooting guides are safe yet effective. If you’re one of the owners of this device, continue reading below as this post may help you.

However, if you are searching for a solution to a different problem, make sure you visit our Galaxy J3 troubleshooting page for we have already addressed a lot of issues reported by our readers. In case you need more help, fill up our questionnaire and hit submit to contact us.

Troubleshooting Galaxy J3 that keeps restarting


It is important that we check the phone for possible physical and liquid damage before we actually troubleshoot it. Remember, the Galaxy J3 doesn’t have the IP68 rating like the flagships. Then, we’ll move on to making sure it’s not a battery-related issue and the rest follows…

Check for physical and liquid damage

As to physical damage, it’s easier to check your phone for it since any force that will cause issues inside the device should leave marks, dents or even just scratches on the outside. It’s your phone so you should know if the phone got dropped on a hard pavement or not.

For liquid damage, it’s a bit complicated but you can do it on your own…

  • Check the charger/USB port for signs of moisture and if it looks like it’s wet, get a cotton swab  and clean around the area or insert a piece tissue into it to absorb moist.
  • Remove the SIM card and look into the SIM slot to find the liquid damage indicator. If the LDI remains white, your phone is free from liquid damage but if it turned red, pink or purple, then it’s positive.

Should you discover there are signs of physical and/or liquid damage, it’s better that you bring the phone to the tech.

Connect the phone to the charger

This isn’t to know if the phone charges or not but to know if the phone still restarts even if it has a stable power source. As you know, the battery will be the first one to deteriorate over time and when this happens, your phone may restart on its own from time to time or even shut down. Connecting your phone to the charger will give it a stable power source so if the problem is the battery, your device wouldn’t restart when used while connected to the charger. So, assuming that this is the case with your phone, you also need to bring it to the tech and have the battery replaced unless you want to continue using your phone and deal with the problem every day.

Observe your phone while in Safe mode

There is a possibility that one or some of the apps you installed is causing the problem especially if the problem still continues even if the phone is connected to its charger. At this point in our troubleshooting, it’s better to rule this possibility out and to do that, you have to start your phone up in Safe mode to temporarily disable all third-party apps:

  1. Turn the device off.
  2. Press and hold the Power key past the screen with the device name.
  3. When ‘SAMSUNG’ appears on the screen, release the Power key.
  4. Immediately after releasing the Power key, press and hold the Volume down key.
  5. Continue to hold the Volume down key until the device finishes restarting.
  6. Safe mode will display in the bottom left corner of the screen.
  7. Release the Volume down key when you see ‘Safe Mode’.

Continue using your phone while in this mode and if the problem doesn’t occur, then you should find the apps that suspect are causing the problem and uninstall them one by one:

  1. From any Home screen, tap the Apps icon.
  2. Tap Settings.
  3. Tap Applications.
  4. Tap the desired application in the default list or tap Menu icon > Show system apps to display pre-installed apps.
  5. Tap Uninstall.
  6. Tap Uninstall again to confirm.

However, if the problem continues while in this mode, try doing the next step.

Wipe the cache partition

Wiping the cache partition will delete all system caches and replace them. You know, some of those cached files may have been corrupted or are already obsolete. Considering the fact that this problem might be with the firmware, this procedure may help fix it. All you gotta do is start your phone up in recovery mode, or follow these steps:

  1. Turn off the device.
  2. Press and hold the Volume Up key and the Home key, then press and hold the Power key.
  3. When the device logo screen displays, release only the Power key.
  4. When the Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  5. Press the Volume down key several times key to highlight ‘wipe cache partition’.
  6. Press the Power key to select.
  7. Press the Volume down key to highlight ‘yes’ 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.

If the problem still remains after this, then you really have to reset your phone to fix the problem.

Backup all your files and reset your phone

This is your last resort and it goes at the end of the guide because of the hassle you will have to undergo in backing up your files and data. Even if your phone has serious firmware issue, the reset may be able to fix it. Follow these steps after you’re done backing up your important files and data to reset your device:

  1. Back up data on the internal memory. If you have signed into a Google account on the device, you have activated Anti-theft and will need your Google credentials to finish the Master reset.
  2. Turn off the device.
  3. Press and hold the Volume Up key and the Home key, then press and hold the Power key.
  4. When the device logo screen displays, release only the Power key
  5. When the Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  6. Press the Volume down key several times key to highlight ‘wipe data / factory reset.’
  7. Press Power button to select.
  8. Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
  9. Press Power button to select and start the master reset.
  10. When the master reset is complete, ‘Reboot system now’ is highlighted.
  11. Press the Power key to restart the device.

Should the problem continue after the reset, bring your phone to the tech as it’s most likely a hardware problem. I hope that this troubleshooting guide can help you fix the problem with your phone.

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