Constant searching for gears when in Cruise Control

[JCB460LS]

We have a 2017 RX 350. When in Dynamic Cruise Control set anywhere between 35 and 70 mph the car is constantly reaching for a gear to be in. Has anyone experienced this?

[1990LS400]

Is it really bothering you?  The 8-speed transmission changes gears so that the engine runs in its most fuel efficient rpm range with excellent power on demand.

I usually don’t even notice the shifting of the 8-speed transmission which was  much more noticeable with the previous 6-speed transmission. 

I assume you are driving in areas with at least modest size hills.  If it's shifting when driving on completely flat roads, then there is a defect.

Edit:  Whoops!  The 2017 still had the old 6-speed with the much more noticeable shifting on hills.

[JCB460LS]

Jus talked with our Lexus Service Manager and he said that Lexus is aware that it is a problem with some 2017 RX 350 and they just got a complaint on a 2019 LS. Lexus is working on a fix for reprograming the transmission but have to get it approved by the Feds who are not working at present so fix will be delayed.

[JCB460LS]

Our 2017 RX has the 8 speed transmission