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Cause 1 of 3: Automatic mobile data usage is turned on
If automatic mobile data usage is turned on, your phone will use mobile data when the connection to the Wi-Fi network is poor.
Solution: Turn off automatic use of mobile data.
Find "Wi-Fi preferences"
Slide your finger downwards starting from the top of the screen.
Press the settings icon.
Press Network & Internet.
Press Wi-Fi preferences.
Turn automatic use of mobile data on or off
Press the indicator next to "Allow use of mobile data when Wi-Fi is connected" to turn the function on or off.
Return to the home screen
Press the Home key to return to the home screen.
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