(b)(4).Investigation - a review of the complaint history, manufacturing instructions, and quality control were used to investigate this event.The reported device was not returned for evaluation, therefor a definitive root cause could not be determined.A review of the device history record did not reveal conditions that could have contributed to the reported event.A quality engineer risk assessment was conducted to assess the risk of this failure mode and concluded a changed is not required, thus no risk reduction activities are required at this time.The appropriate internal personnel have been notified and we will continue to monitor for similar complaints.
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