Hi Yamor, welcome to the community!
Follow these steps one after another, verify whether the problem was solved after each method before trying the next.
- Restart your device. Turn off Wi-Fi® and then turn it on again.
- Android™ version 4.3 and later: Turn off Wi-Fi®. Disable Scanning always available in Wi-Fi® settings. Turn on Wi-Fi® again.
- Restart the router. Check that your router is Wi-Fi® certified. Your device is Wi-Fi® certified, so if the router isn’t, the devices may not communicate properly.
- Check that you have the required password if you are using a secured Wi-Fi network. A secured Wi-Fi® network requires a password. Contact the relevant Wi-Fi network administrator for more information.
- If you are in a location with several Wi-Fi® hotspots, make sure you have selected the correct hotspot.
- Verify that you are within range of the Wi-Fi® router. Check the Wi-Fi® signal strength in the status bar. If the signal is low, or there is no signal, move closer to the Wi-Fi® hotspot, that is, the device that provides the Wi-Fi® network.
- Don’t cover the Wi-Fi® antenna area of your device.
- Make sure that the Wi-Fi® standard 802.11b/g/n is enabled on the Access Point. For instructions, refer to the Access Point user guide.
- Verify that the Wi-Fi® network is visible (SSID is broadcasted).
- Make sure that both the device and the router are using the latest software versions.
- Using the browser in you device, go to www.sonymobile.com/global-en/software/ and check for the latest software updates.
- To update the router software, contact the router manufacturer to get detailed instructions.
- Check the router settings using your computer. If you are not sure how to change the settings, check the user guide for the router or contact the router manufacturer.
- Check that your Access Point/router is not set to use channel 12 or 13. These channels are not supported in all markets. Change the channel to any number between 1 and 11 on the AP/router.
- Add your device's MAC address to the MAC filtering table of the Wi-Fi® router. Some routers require your MAC address. For instructions on how to add the MAC address to the MAC filtering table of the router, check the user guide for the router or contact your router manufacturer.
- Some Wi-Fi® networks require that you sign in to a web page before you can access the network. Open the web browser in your device to sign in. Contact the Wi-Fi network administrator for more information.
- Try using a static IP address.
- Add a Wi-Fi® sleep policy. Wi-Fi® turns off by itself.
Keep us updated, I do hope theses steps have helped 
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