I have different problems with the Lexus cap. They tend to crack on the surfaces of the plastic covers and I had replaced 3 of them in a year so far.
Shoot! I should have gone to the dealer. Now , I am out $100 for the cracked caps. Well, next time, I will.I kept breaking or losing centre caps on my CT F sport and my Lexus dealer kept replacing them (no charge). No problems lately.