From the manual :

Before calibrating, it is important that the unit has been turned on for at least two hours in order to attain working temperature.

Being analog this makes sense. Not sure if temperature might be related to your problem.

As the calibration is a software process it is possible of having a bug. Not saying there is, seems unlikely, but possible. In which case there would be a software fix.

Also from the manual:

Analog Rytm is factory calibrated. It should not be re-calibrated unless specifically stated by Elek-
tron Support.

Not sure of the criteria Elektron support has for telling you to calibrate. They obviously don’t want users doing it for reasons.

Definitely talk the Elektron support.

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