NXT EVO z-axis (slider), frequently jittering only at extremes (0 & 65535)

[HGB_0378]

Hello,
I've been having an intermittent issue with the z axis (slider/throttle), which frequently jitters just at both extremes. With the slider all the way to the Top or Bottom, the signal does not reach the expected value of 0 and/or 65535, and stays at a different value jittering, until the slider is moved a few times out of position and back (top or bottom), and then it works fine again, for a certain time. I'd like to emphasize, that in any other position, or when the problem is not present, the slider works perfectly fine.
I've noticed that the issue has increased in frequency and duration over time. I'm talking months, not days or weeks. It's a long term issue.
I've never changed the firmware since day one, as everything worked fine before, so I didn't want to risk any changes.
It looks like it could be a loose magnet problem, but I could not find any specific instructions to access the slider magnet/sensor, to check if there is anything loose, or any metallic particle that could be interfering.
I'm attaching images for you to see.
Please advise.
Thanks in advance

[Ron61]

Show the Profile-Axes tab from the configurator.
There is nothing wrong with updating the firmware, and I don't see any point in sitting on an ancient one.

[HGB_0378]

Hi Ron61
Attached is the requested image.
Do you recommend to update firmware right now?
I just thought adding another variable to the issue was not necessary, but if you think is best I'll do it right away.
Thanks again

[HGB_0378]

Hi Ron61
Checking the Physical Axes tab, I've just realized that z-axis (4), "Input" value is set to "Analog", so I guess no sensor, it seems to be a potentiometer, if I'm not mistaken.
Anyhow, I'll wait for your advise/recommendation.
Thanks once more
HUGO

[HGB_0378]

Hi there
Any news on this issue?
At least some guidance on the required steps for accessing the board where the pot is mounted, so I can see if I can try to clean it with some special cleaning solution like DeOxit Faderlube or similar???
Thanks in advance

[Ron61]

Try updating the firmware and configurator, it won't take much time.