Hi all, I know this is an old post but decided to add my few cents since I bought a 2019 ES300h few months ago and it's having the same issue. I took it to a dealership and they've sorted the rattling by tightening the bolts around sunroof (I was told that Lexus has released a bulletin for this specific problem). It solved the issue for about two weeks and the rattles are now back (not as bad as before though). Interestingly, I have been given another ES300h as a replacement car with only 4k miles on the clock and I could already hear a ticking noise coming from the sunroof. My conclusion is that it is a design flaw and cannot be fixed permamently.
