I had the same problem. I searched in internet and almost every one said to change the clutch or GB. I went to Toyota Service and an honest man told me that with cleaning the gears and electric gear changer and some other stuff it would be ok. They cleaned and worked for me just for 200 €!
@esatcebi82: I have the same issue, how did you know that it's the NSS, I checked with Toyota, they mentioned that they need to change the whole clutch and it will cost over 3000 Euro
Unfortunately that is what the mechanics told me also. So I sold the car to a dealer and he said he had to replace the whole clutch. What a headache car. I hope you can get yours fixed or get a new car, sorry to hear about your troubles.
