Hie. Im having major issues with my Gk3 non hybrid. When i start it it drives and changes gears normally but after driving for 20km or so the gear display starts to flick but its like the screen is displaying all gears at once. After this it loses drive all together. If i shut it off start it again and put it in drive it shudders violently like its trying to take off in third or fourth gear. Replaced the gearbox with second hand imprort unit but the problem is persisting. What could be the issue.