Good news, then it is like I suspected - poor handling from my part… :)
It is the midi-values that are re-setting when i turn the power of. It goes back to omni mode and the assigned note-numbers go back to default also. (or the previous setting at least).
I was hoping that maybe I am missing a "Save"-button somewhere. Or should it remember setting just like that, without any special "save" procedure?
best / Peter