After the unit and TV are connected using Bluetooth, the soundbar remembers the TV as the connection. Even when switching the Bluetooth function, the unit may connect with the TV and not be able to connect to devices other than the TV.
In this case, try pressing and holding the BLUETOOTH button of the soundbar for 2 seconds.
NOTE: If reconnecting with the TV, it is necessary to select the unit from the list of Bluetooth devices on the TV. For details on how to operate, see the instruction manual of your TV.