Sony Xperia XZ1 Manual page 28

Device: Click
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Router: Contact the router manufacturer for instructions on how to update the
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router software.

Check the following router settings using a computer. If you are not sure how to change
the settings, check the user guide of the router or contact your router manufacturer.
Network mode/speed: Change to auto or mixed mode instead of b, g or n.
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SSID and password: Make sure there are no special characters or characters
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which are not in the standard ASCII character set.
DHCP: Make sure it's turned on. You could also try setting a static IP address if
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you have problems accessing the internet using your Wi-Fi connection.
MAC filter: Make sure it's turned off. Also set your device as allowed.
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Channel: Try using another channel, preferably 11 or lower.
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
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 adding MAC addresses to the MAC filtering table of the router, refer
to the router user guide or contact your router manufacturer.
To check the MAC address of your device
0. Find and tap Settings > SystemAbout phone.
1. Tap Status, then find Wi-Fi MAC address.

Perform a factory data reset. This is sometimes the best solution if your device stops
functioning properly, but note that it will delete all personal content saved on the
internal memory of your device. Make sure to back up data that you want to keep.
To back up your data using a computer
My Wi-Fi connection keeps dropping
Xperia™ XZ1 Dual SIM support overview

Restart your device and turn off Wi-Fi, then turn Wi-Fi on again.
To turn Wi-Fi on or off
1. Find and tap Settings > Network & Internet > Wi-Fi.
2. Tap the slider to enable or disable Wi-Fi.
here to check for software updates for your device.