I tend to agree. I can repeat the problem by pumping down the pressure, and then reverse by releasing the pressure again.
This makes me think there's no issues with the batteries. I cannot test actual diving for a longer while alas. If i could, i could test diving without any under pressure in the housing to see what difference that would make.
IF the problem is a too soft button that pushes down by pressure, however the effect of the water pushing the buttons should soon overshadow the effect of the vacuum pump and give the same result.
For now, the main culprit must be assumed to be a misalignment or bad button.
I think i have to do what you suggests, okuma, however I don't know how to check the button play when the housing is closed. I would very much appreciate suggestion for this. How about you Nauticam dealers, how do you analyze issues like this?
My wag (wild ass guess) is that under vacuum/depth pressure there is an applied force/torque being applied to your camera body.
After pumping down and at depth can you verify that there is a slight clearance between all invividual controls and the camera body?