Enter the Airplane Mode on the phone connected to the watch will break the connection.
After that, Auto Reconnection will not be triggered by simply exiting the phone's Airplane Mode.

Auto Reconnection also will not be performed if you disable the phone's Bluetooth and then re-enable it.

Auto Reconnection will be performed, however, if the conditions below are satisfied.

• If the watch recovers from the Power Saving state and attempts to reconnect.
• If the phone that exited the Airplane Mode is close to the watch and its Bluetooth is enabled.

To re-connect manually after entering the phone's Airplane Mode or after turning off the phone's Bluetooth

1.

On the phone's Home Screen, tap the G-SHOCK+ icon to restart the G-SHOCK+ app.

2.

Perform the procedure under "To re-connect manually to the last-connected phone".