While driving the 2019 Ford Expedition the transmission intermittently has an issue where there is harsh or extreme delayed engagement and loss of power. This has occurred while attempting to merge on the highway in traffic and put myself and highway drivers at risk when it suddenly was not possible to accelerate to merge safely. The component was inspected by the Ford dealer and their response was to re-program the transmission software, however this has not resolved the issue and it still occurs. There were no warning lamps or indicator to show that the vehicle has a problem.