Panasonic HC-X920 Operating Instructions Manual page 142

Problem
It takes long time every
time to connect to a
smartphone.
This unit is not displayed
in the Wi-Fi setting screen
of the smartphone.
The Wi-Fi connection is
disconnected immediately.
≥ It may take longer time to connect depending on the Wi-Fi
connection setting of the smartphone, but it is not a
malfunction.
≥ Try switching the ON/OFF of the Wi-Fi function in the Wi-Fi
settings of the smartphone.
≥ If there is a setting for avoiding poor connections in the Wi-Fi
setting menu of the Android device 4.0 or later version, turn it
OFF.
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Check points