Hello All I am from Brazil, I have a Scuderia 2008 with 29k km ( 18k miles). This car’s gearbox started shifting itself to Neutral when I shift from 4 to 5th, only if I am under 4k rpm. And only after more then 30 minutes driving the car. If I shift in Superfast mode (more then 4k and more 50% throttle), the system works fine. If I put the 5th, in Superfast mode, I can go to 6, 5, 4, 3, 4, 5, 6 with no problems. If I do 2 gear, then 3, 4….. no 5. It will only shift properly from 4 to 5 with Superfast or in normal mode, with the car cold. The car, in the begging of my problem, had always shown P1768 ( the error regarding the Superfast not learned.) I trained several times to do this calibration, some times with SD3, TEXA or with LAUNCH with no success. Even to do DEIS CALIBRATION, after the fail in DEIS, the car would not start. We started changing the clutch, and I will list all the actions that we already attempted to solve the problem. Clutch 222090 Clutch bearing 234943 Mouting Flange 207539 And clutch position sensor. 219340 After this, DEIS calibration worked, only if I tried with car yet cold, if the car runs more then 10 minutes, I got the message, DEIS FAILED CLUTCH SOLENOID EXCESSIVE CLEARANCE - ( something like that ). If I wait, DEIS START TO WORK again. But the main symptom, remains. 4-5 after cars is hot. I had the brilliant ideia to cool down the clutch pressure sensor 203294, I did this, the car came back to work. I tried to measure the temperature on the sensor with a laser gun, and the temperature was about 120 Celsius degrees when the car start to fail. On the next day, I warmed up the sensor with a heater gun, until 120 celsius, without turn on the engine… As soon I started the car, I start to have problems…. Then we bought a new pressure sensor, 203294. Nothing changed… I started to think that my actuator had too much play, because the pot values are to different, as you move the finger by hand. I went to the US, and rebuild the actuator with GTE Engineering. They tested everything and told me that my actuator had a lot play, and also some leakage. Serkan seems to do a nice work, and rebuild my actuator. I installed it again, and had the same issue. Problem 4 to 5 when the car is hot, under no load…. After this, we disassemble the valve body, cleaned in ultrasonic cube. We changed the EVF solenoid, that have too much leakage 100-150 cc/mim. My pump was Turing on so often, like every 30, 40 seconds… after the new EVF, we start to have 6 to 7 minutes in idle, before pump on. Now we have 10.2 cc/mim and 13.2 cc/min. Nothing changed in the main symptom. The car was not able to complete the Superfast self learning. I checked the current in the pump motor with the oscilloscope and realize the the motor is starting to fail… I put a new motor 248083, then the car start to do the super fast learning, no more P1768. Any error. Nothing changed in the main symptom. Now the car can do self learning, DEIS, Superfast calibration, my delta actuator center changes between -102 and -118. But the main symptom do not change. When my Evaluated transmission oil temperature goes above 50 degrees Celsius., the problem start to happen. Somewhere in this meantime, I bought also a new TCU. My original TCU is 02.10.08 SW: EAGD51W07, and the new one is 26.08.16 SW: EAGD53Y04. Both TCU can do the 3 learning routines, When the problem starts, I can stop the car, change the TCU and nothing changes about the symptom. When the car fails, that gearbox sign in the dash stays on, I have no erros in the scanner. If ai tried to engage any gear, the system do not allow, I need to turn off the car, wait some seconds to the GEAR indicator in the dash to turn off, press both paddle to put the car again in neutral ( the car is already in neutral, some times flashing, some times no), start the car again, and everything start to work again, the car will fail in 4-5, with light load, under 4k rpm, If I go to 5 by "Superfast", I can use 6, 5, 4, 3, 4, 5, 6 or any sequence, with no problem. IF, for any reason, I put the 2 gear... 3, 4, when it arrive at 5, the problem will appear again. I am using 75w140 MOTUL GEAR FF on my gearbox, but I have the same issue with the original Shell, with 75w90 MOTUL gear and with 75w90LS MOTUL. In the F1 I am already trend CHF 11S, MOTUL MULTI ATF, and Shell DONAX. No changes in my symptom. I am uploading some videos and photos to Youtube to show exactly the problem. Anyone have any other suggestion? Any advice would me much appreciated. Thanks in advance for reading my Scuderia novel until the end.