01-03 15:57:39.569: ERROR/MountService(96): Failed to share/unshare
01-03 15:57:39.569: ERROR/MountService(96): com.android.server.NativeDaemonConnectorException: Cmd {volume unshare /mnt/sdcard ums} failed with code 400 : {volume operation failed (Invalid argument)}
01-03 15:57:39.569: ERROR/MountService(96):     at com.android.server.NativeDaemonConnector.doCommand(NativeDaemonConnector.java:246)
01-03 15:57:39.569: ERROR/MountService(96):     at com.android.server.MountService.doShareUnshareVolume(MountService.java:397)
01-03 15:57:39.569: ERROR/MountService(96):     at com.android.server.MountService.setUsbMassStorageEnabled(MountService.java:1275)
01-03 15:57:39.569: ERROR/MountService(96):     at android.os.storage.IMountService$Stub.onTransact(IMountService.java:82)
01-03 15:57:39.569: ERROR/MountService(96):     at android.os.Binder.execTransact(Binder.java:288)
01-03 15:57:39.569: ERROR/MountService(96):     at dalvik.system.NativeStart.run(Native Method)
01-03 15:57:39.569: ERROR/MountService(96): Failed to remount /mnt/sdcard after disabling share method ums

현재 검수 센터에 맡겼는데... 이런 로그가 발생하였다고 합니다.
게임상에서 디바이스상의 캔슬키를 눌렀을때 랜덤적으로 발생해서..
이것이 무엇인지 자세히 몰라서.
질문 드려봅니다.