I have been having problems with the remote start on my 2019 LT2. Randomly the remote start will not work with the fob or the app. GM service took the fobs apart thinking there was moisture in them then gave me a piece of paper telling me how to start my car remotely. Neither of these were the problem. The locks will engage but starting does not occur. The door lock feedback beep works sometimes when I'm using the fob but not always. Last week I went to start my car and found all the windows down and the rear hatch open. Neither fob was in the vehicle. Took the Traverse back in for service. The dealership had to bring a specialist from corporate to troubleshoot. We discovered that a second 2019 Traverse was at the dealership and had the same problem with the windows and rear hatch. Vehicle is still at the dealership without resolution.