Response to Uneven Negative Development

Is there a sharp borderline between the two regions of such a flawed negative? In the case of a processing problem, I would expect the line to be soft, diffuse. Also, I wouldn't expect that this is a processing problem because the dividing line is transverse to (and not along) the film (if I understand you correctly). I am not familiar with your camera, but I assume it has a focal-plane shutter? If so, I would expect this shutter to have a vertical slit. In that case, one might suspect the shutter as the cause of the problem. It might just get a bit faster sometimes, or the first curtain stops for an instant, causing the slit to become narrower, thus exposure to decrease over an area of the negative.

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