Panoramic sunroof initialisation / re-set process

[kvc]

I've read that you can 're-set' the pano sunroof by holding down the centre button for 30 seconds or so.
I tried this, in an attempt to clear a constant error code that I have had since owning the vehicle, not that the sunroof has ever given me any problems....
The sunroof opens as normal, however when I try closing it, the sunshade only moves in short bursts (about 3 inches or so) and takes 10 or more clicks of the 'close' or forward button to complete what used to take one-touch.
What have I done????