Ruff

I own a 2003 ES300, and the transmission is the most irregular and uncomfortable shifting automatic of any automobile(15 total) I have ever owned. My poor 71 year old wife has her head jerked every time it downshifts suddenly after a delay. There are times when I want instant acceleration and the delay in shifting is scary! I have had two computer upgrades, but they have not eliminated the problem. It also now shifts at higher rpms than it did when I purchased it, giving me overal poorer milage. Lexus, please help us out!