2000 Sebring hard to start when warm

We have a 2000 Chrysler Sebring Convertible we purchased new that is in good shape with only 27,000 miles on it. Our problem is that it is it doesn’t like to start when the car is warm. It starts easily when cold but if we drive it someplace and it sits for a short time it is hard to start. We have had it to the Chrysler dealer 2 or 3 times, had the fuel injectors cleaned, new battery, tune ups, etc. We get it back and it seems to be better for about a month, probably wishful thinking. We are think it is some type of sensor that needs to be replaced. We have heard one of your shows, a different car but similar problem and there was some type of temperature sensor that controlled the fuel injectors that needed replacing. We like the car but I can’t trust it for my wife to drive. One thing I have resorted to is to revving up the car before shutting it off and that seems to help with the starting problem.
Thanks for your assistance