2014 Lexus LS 460 - Issues starting

I have a 2014 Lexus LS 460. Has approximately 35,000 miles. I have problems starting vehicle (during hot months). It cranks, starts, then shuts right off. Usually starts after numerous tries. I’ve taken to Lexus dealer , and they cannot duplicate problem nor does it store any trouble codes or history of even having problems. I had same problem year ago and they said battery. I replaced cause stated it was low. Now battery test fine but problem is reoccurring. Please help

Very complicated car. I can’t offer any help since I cannot diagnose the problem from the internet.

I’d suggest if your Lexus dealer is no help, go to another Lexus dealer and try to get a better tech to work on it.