With some devices, the Inner Balance sensor may be competing for resources with Wi-Fi and/or maintaining a cell connection.
You may need to turn on Airplane Mode and then turn Bluetooth back on in order to get the sensor to work.
Please Note:
Once Airplane Mode is activated, your Phone turns off both the Wi-Fi and cellular connections. This means you will no longer be able to make or receive calls, texts, or e-mails, or browse the Internet (basically, anything that requires a data service connection will not work while Airplane Mode is activated).