• The Stimpod is in ‘TWI’ mode. In this mode, the device does not communicate with the accelerometer.
• The Stimpod is in ‘TET’ mode. In this mode, the device does not communicate with the accelerometer.
• There could be a momentary interference that interrupted communication between the accelerometer and Stimpod.
• There could be a problem with the accelerometer cable.
• There could be a problem with the Stimpod.