Self-changing volume on OD-11

My OD-11 speaker is behaving strangely: if the volume knob is set to 20 or 40 it plays normally, but if it is set to, say, 39, it will “turn itself down” step by step all the way to 20. SImilarly 41 will turn itself down to 40.

Has anyone ever seen anything line this? Or have any ideas on how to fix it?

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i think ive seen this on my ob4, but not to such an extreme degree, in my case it just rounds down to the nearest supported step.