It was reported that the handheld device froze on the interrogation screen on (b)(6) 2011.A hard reset was performed and the issue resolved.Additional information was received stating that the handheld device froze again on (b)(6) 2015 when attempting to interrogate a vns patient's device.A hard reset was performed and the issue resolved.The frozen screen issue with the software flashcard was previously investigated and the root cause was determined to be due to a failure in the api function that results in control of the device not returning to the cyberonics software.The most probable cause is an anomaly in the interface between the microsoft provided software and the (b)(4) hardware which results in the (b)(4) inability to locate specific memory directories within the file system.
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