Ensure your NuraTrue and case are charged. You can find out more by selecting Charging Your NuraTrue and Case below.
Ensure the infrared (IR) sensor is clean and not obstructed. The IR sensor is located near the base of the ear tips, and there is a circular cutaway for the sensor on the wings. Try wiping the IR sensor with a tissue or cloth, and make sure the wing fixture isn't covering the sensor.
Reset your NuraTrue by performing a Device and Sleep Reset. If the issue persists, please try a Factory Reset, if possible. See NuraTrue Reset below for the steps.