Transmission Not Engage problems of the 2017 Hyundai Santa Fe

I have had on at least a half dozen times where the vehicle will not accelerate after stopping, and then attempting to accelerate. For example: leaving a parking lot going onto a roadway attempting to accelerate quickly to get up to the speed limit. Attempting to turn left at a flashing red left turn lane traffic light. The vehicle will roll about 10-20', but will not accelerate, like the transmission is not engaging. Sometimes the engine will rev to 4000-5000rpms. I will quickly let off of the throttle, then it will take off. The engine does not rev every time. The dealership replaced a module on the transmission approximately one year ago, but it did not help. They had it for one day in July 2020, attempting to replicate the problem, but to no avail. The most recent incident with the vehicle where this failure to accelerate occurred was 12/26/2020, where upon leaving a service station onto a four lane road, it once again rolled to 10-15 mph, but would not go while the engine rpms went to 4000. As traffic was rapidly approaching I kept my foot on the throttle, and it finally started picking up speed. This is getting to be a dangerous vehicle to drive.

When accelerating from a stop and entering traffic, when you press on accelerator the transmission dis engages and leaves you in the middle of the intersection with no power and putting you in danger of being hit. Once transmission kicks back in, the engine revs and vehicle jolts. This is very dangerous and will get someone killed. Hyundai has to address this issue.