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@Frank
I might have answered my own question.
I have a setwatch enabled on 'BTN', and according to the setwatch documentation it appears that pin A0 may be affected by the setwatch command?
Is that maybe the reason for my A0 PWM problem?
Update: it seems that the setwatch command is not the cause of my problem. Even after removing the code there was no improvement in the PWM behaviour of pin A0