Sony NWZ-A826 Operation Manual page 241

SONY:
English
About the Bluetooth Communication
Check the following before using the player.
The following environment may shorter communication range, sound breaks, or
ending Bluetooth communication.
-When you perform Bluetooth communication near metal objects.
-When a device using radio waves, such as a wireless LAN device, or a microwave
oven, is in use near the player or the Bluetooth device.
-When the Bluetooth antenna (aerial) of the player is covered with obstacles such as
hands.
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...
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Bluetooth antenna (aerial)
When Bluetooth communication is unstable, communicating conditions may be
improved by changing the location between the player and the Bluetooth device, or
doing the communication away from another wireless device.
If the connection ends, reestablish it.
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