Investigation: no product is at hand.Batch history review: the device history records have been checked and found to be according to the specification, valid at the time of production.There is no indication for a material failure or a manufacturing defect.No further complaint registered against the same batch number.Conclusion and root cause: based on the information available, the root cause of the failure is most probably related to an insufficient usage.Rational: based on the quality standards, we exclude a material or manufacturer caused error.It is possible that an insufficient usage resulted in the described failure.No capa is necessary.
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