After owning and loving an ES300 for many years, I purchased a 2014 ES350 and immediately was bothered by the same transmission problems that all of you have noticed. My one additional problem that none of you have described is that after the transmission down shifts, if I continue to coast, the car will upshift, giving a slight surge in speed on its own.
I phoned to make a service appointment and after I told my problems to the telephone receptionist, she immediately replied that there is nothing wrong with the car and it is operating the way it is designed to operate. She then connected me to someone who appeared to have been chosen specifically to deal with this exact complaint. This person told me that the ES350 is different from an ES300 and that the ES350 has a computer controlled transmission that is designed to operate exactly as I described.
I brought the car in for service and went for a test drive with a repair person who appeared to have been specially selected for this problem. He already knew the issues. The problems did occur during the test drive. Although the Lexus service person minimized the problems, he did admit that all my problems were occurring. He said that the car was operating exactly the way it was designed to operate and if I didn't like the way is was driving I shouldn't have purchased it. He suggested that if I don’t like the way it drives, I should purchase another brand (not a Lexus), and trade in my two month old car. A computer check was done on the car, probably because Lexus pays the dealer to perform the check, and the computer verified what I had been previously told, that the car was performing exactly as designed.
Up until two months ago, I would not have expected that I would ever purchase any car but a Lexus.
I wonder what some other Lexus owners think of my experience.