Bang & Olufsen BeoPlay A9 User Manual page 16

Your device may be out of range. Move it closer to your music
system.
Switch off all other Bluetooth devices within range or disable their
Bluetooth functionality if possible.
Move your device away from other devices that generate
interference such as, cordless phones, microwave ovens or
wireless equipment.
Switch your Bluetooth device off and back on.
Switch your music system off and back on.
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