Invaled calibration error

[photoenthusiasm]

I had some moments where this error showed up on my h3d-ii 31 Mainly I work tethered, either on my windows pc or on my macbook pro. Recently I had the same problem when giving a workshop, the camera tethered to the macbook. Without disconnecting (shutting down the camera and phocus) I released the firewire from the camera, got the code and nothing helped anymore. Back in my studio I connected the firwire to the windows pc, started phocus and after that the camera: problem gone. Even after shutting down everything the camera remained working normally, also untethered. Can anyone explain this to me??