im having the same problem with my EBII S, it goes down like it should but when winding up it will start to become stiff tell just 5cm away from closing it decides to behave.
mine wobbles around a little bit when its wound down half way, and this i just started to notice too, i bought that car not to long ago, just after end of may, something the prievious own forgot to mention i guess

im goin to rip it open and have a looksee soon, tell ya if i see anything