How to fix your Sony Xperia XZ3 smartphone that suddenly won’t connect to Wi-Fi [Troubleshooting Guide]

Wireless connectivity issues can come with various symptoms from slow Internet connection, to Wi-Fi drops or no Internet connection at all. Any of these symptoms can occur on your phone at any time unexpectedly. Many factors can cause Wi-Fi problems in mobile devices. Among the usual triggers are network outages, server downtimes, incorrect network settings, faulty updates, and corrupted Wi-Fi firmware.

In worst cases, the problem can be attributed to hardware damage like a damaged Wi-Fi component on the phone or busted router or modem in use. Tackled in this post is a similar issue affecting the Sony Xperia XZ3 smartphone. Read on to find out what to do if suddenly, your Xperia XZ won’t connect to Wi-Fi.

Before we proceed, if you’re looking for a solution to a problem with your phone, try to browse through our troubleshooting pages to see if we support your device. If your phone is in the list of our supported devices, then go to the troubleshooting page and look for similar problems. Feel free to use our solutions and workarounds. Don’t worry it’s free. But if you still need our help, then fill up our Android issues questionnaire and hit submit to contact us.

How to troubleshoot Xperia XZ3 that won’t connect to WiFi

Before you begin troubleshooting wireless connectivity problems on your phone, try to move your device closer to the Wi-Fi access point or your wireless router/modem. If necessary, try to move your wireless router/modem away from any possible obstruction or interference. Also make sure that the Wi-Fi signal strength in the status bar of your phone is full. If there is no signal or the signal is low, try to move closer to the Wi-Fi router/modem.

Finally, don’t cover the Wi-Fi antenna area of your phone (upper-left side of the phone). If you’ve already done all that but still your phone won’t connect to Wi-Fi, then try these workarounds to deal with software errors on the phone that may have halted Wi-Fi functions.

First solution: Reboot/soft reset your phone.

The simplest possible solution you can try first would be a soft reset on the phone. This helps clear minor software glitches that may have caused network conflicts and minor Wi-Fi problems on the phone. Here’s how to perform a soft reset on your Xperia XZ3 smartphone:

  1. Press and hold down the Power button for a few seconds and then release when the menu opens.
  2. Tap Restart.
  3. Your phone then restarts automatically.

Alternatively, you can force your phone to restart by pressing and holding down the Power button and the Volume Up button simultaneously for about 6 seconds. When your phone vibrates, release the buttons. Your phone then restarts.

Both these methods won’t affect any saved data on the phone storage.

Second solution: Forget/delete Wi-Fi network from your phone.

When the Wi-Fi network gets corrupted, it won’t be able to work as intended. Faulty updates are usually the trigger. And this may be the reason why your phone is unable to connect to Wi-Fi. To clear out network errors, you may need to delete or forget the Wi-Fi network profile in use. Here’s how to it’s done:

  1. Swipe down the Home screen to open the notification panel.
  2. Select Settings.
  3. Navigate to Network connections then tap Wi-Fi.
  4. If Wi-Fi is off, tap to enable it.
  5. Select the Wi-Fi network profile that you want to delete.
  6. Then tap Forget.

The select Wi-Fi network profile will then be erased from the phone. Restart your phone then set up your Wi-Fi network then reconnect.

Disabling the smart network switch feature on your Sony Xperia XZ3 can also help prevent your device from getting an unstable wireless connection.

  • To do this, enable Mobile Data on your phone then go to Menu-> Settings-> Wireless-> Smart network switch.

Remove the check from the box next to this option to prevent your device from automatically switching between Wi-Fi and mobile data network.

Third solution: Toggle Wi-Fi, Airplane Mode off and on.

This is another simple old trick that has done wonders to many smartphone owners who have encountered Wi-Fi connectivity issues. Turning Wi-Fi off and then back on helps clears minor network errors and refresh Wi-Fi connection on the phone. So here’s what you should do then:

  1. Tap Settings.
  2. Navigate to Network & Internet.
  3. Tap Wi-Fi.
  4. Tap the Wi-Fi switch to disable Wi-Fi for a few seconds and then tap the switch again to enable Wi-Fi.

Aside from Wi-Fi, toggling the Airplane Mode switch on and off also does the same positive outcome. Turning Airplane mode on automatically turns off wireless connectivity features on the phone and turning it back on re-enables these features. Thus, it’s like restarting your phone’s Wi-Fi Internet connection.

  • To do this, go to your phone Settings-> Airplane, then toggle the switch to turn the feature on and then off again. You can also access the Airplane mode settings through the notification center. Just toggle the Airplane mode icon on and off.

Don’t forget to test your Internet connection after applying these workarounds and see if the problem is fixed.

Fourth solution: Reset APN/network settings on your phone.

Network settings errors are also among the underlying causes. This is usually what happens after making modifying network settings and options but ended up to an error. The same thing can occur after installing an update that overrides network settings automatically. To clear these errors, resetting the APN or network settings back to defaults can help. Here’s how to reset network settings on your Xperia XZ3:

  1. Tap Settings.
  2. Go to Network & Internet.
  3. Tap the three vertical dots or Menu icon.
  4. Select Network settings reset option.
  5. Tap RESET SETTINGS to confirm.

Your phone will then start clearing data connections and then restores the default network configurations on the phone.

After the network settings reset, reboot your phone to apply the new changes and then re-attempt to connect to Wi-Fi.

Fifth solution: Factory data reset/master reset your phone.

Among the last possible solution you can try on if all else failed to fix the problem would be a factory data reset or master reset. This will erase everything from the phone system including complex network errors that prevent your device from establishing Wi-Fi network connection. This however will likewise result to data loss. Should you wish to continue, back up all important data saved on the internal memory of your phone to an external storage media or your computer. Once you’re done with the backup, perform a factory data reset with these steps:

  1. Tap Settings.
  2. Go to System.
  3. Select Reset.
  4. Tap Factory data reset.
  5. Tap Reset phone.
  6. If prompted, enter your screen unlock password, PIN, or pattern to continue.
  7. Then tap Erase everything to confirm reset.

Your phone will then start wiping all data and then restores the factory defaults. This won’t revert your device to the earlier Android version.

Other options

Reach out to your Internet service provider or carrier for further assistance in performing more advanced troubleshooting methods to deal with more complicated Wi-Fi problems. You can ask them about IP address settings or how to use static IP Address. They can also reset or re-provision your wireless router/modem from their end, if needed.

If you suspect that the problem is hardware-related, then take your phone to the nearest Sony-authorized service center instead. You can also contact the manufacturer or your wireless router/modem and ask them on how to change the router channel settings. They can also help you in updating the router/modem firmware. Like any other electronic devices, the router/modem firmware also succumbs into minor data corruption, which could lead to Wi-Fi problems on the connected devices.

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