A couple of months after driving my 2013 jx35 i began experiencing a shudder/shaking in my vehicle when driving in the 15 to 25 mph range. the entire car shakes severely. it happen when trying to maintain speed in the range of 15 to 25 mph. this is a range commonly driven in school zones, neighborhoods and freeway traffic during rush hour. therefore, this problem is frequent. there is a feeling that i will lose control of the car while driving. i believe it is getting worse with time. the infiniti dealership where i purchased the vehicle initially denied the complaints and stated it was normal for the car to perform this way. i had to enlist infinity usa to get this problem addressed. the dealership completed repairs and stated the condition was remedied. it was not. the car continues to operate with a shudder in that speed range and now while turning corners. *tr