My E320 got the same problem. I did ask the dealer.. Could not find down the problem.. Could not believe they.. not best them toyota...
that the lesson I did learn.. Will not buy the second car.. From M....Also when they hit 20000 miles.. the braker hydrolic ( spell.. may not right) not work.. hit the braker all the way down.. not stop the car.. Make me at that time.. feel to die.. Sorry to told you guy that.. Anyway just want to share the experience.