They already changed the hydraulic oil when I was at 24 000km and all the maintenance stuff that comme with it.
PS: Now I'm at almost 38 000km and the shifter/transmision is running alright, like when it was new... Maybe because it is warmer outside. Well no need to try found something wrong or wielrd, everything is back to normal. :/ Anywait, it drive great and got no more shifter problem after it has been to the dealership the last time (month ago).