Getting back on this, it seems the problem is more obvious when you don't drive the car for a long time.
Both my stilos were affected, I used to thing this was only an issue with my father's stilo, but it seems mine has done the same after some 2 weeks on not driving it. If you drive the car long enought it would eventually work fine again, but it always comes back if you don't drive the car for some time.
Does anyone know what exactly needs to be lubricated?
Cheers.