The log of the affected savina 300 was available for the investigation.Based on the logbook entries, it was confirmed that the device performed a warmstart on (b)(6) 2021 at 10:02 a.M.During ventilation.After the warmstart, active ventilation was resumed automatically.A temporary deviation in the software was identified as the cause of the problem, which was eliminated by the warm start.The device reacted as specified to the detected deviation by performing a restart.During the restart the ventilation is stopped, an audible and visible alarm of high priority is generated, and the pneumatic system opens to allow for spontaneous breathing.A restart last at most 12 seconds after which the ventilation is continued with the last settings.The number of similar cases, related to the same root cause, is within the expected range of the respective risk assessment and thus accepted.
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