This report is being submitted retrospectively as part of internal review.The returned sensor was tested in-house, however, the testing results did not indicate any malfunction of the sensor.The failure mode (sensor performance deviation) could not be reproduced during the returned product analysis testing.This may occur in some instances where the failure mode that presents itself in the body is not reproduced in the lab.A review of the glucose plot showed 2 consecutives drop out phases within 14 days of each other (b)(6) 2023 and (b)(6) 2023), after day 112 post-insertion.These drop out phases coincided with transient shifts in the signal and reference channel.This is potentially due to impacts to the insertion site.The user did not mention an impact to the insertion site in the case notes.However, we do not expect every minor to major impact to the insertion site to be memorable so confirmation from the user is not a requirement for concluding this type of behavior is potentially from an impact to the insertion site.As part of resolution, a return material authorization was issued for sensor replacement.No further resolution was necessary for this complaint.
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