A. Make sure that Bluetooth is enabled on your Android device. Go to 'Settings' > 'Bluetooth' and ensure it is turned on. If it is already on, try turning it off and then back on again to reset the connection.

B. If connectivity issues persist, try restarting both your Android device and the sensor. Turn off your device, wait a few seconds, and then turn it back on. For the sensor, remove it and reapply it if necessary.