NHTSA Complaint #11483699 — 2018 FORD EXPEDITION

About 20 times now, while I am on the freeway, sometimes when I am coasting, and other times when I am trying to quickly accelerate, my car down shifts out of nowhere and loses power, again either when I am in the fast lane coasting, or trying to merge into traffic. It's like it is going to stall and when I step on the gas, it just revs and doesn't get into gear and go. I have almost been rear ended because I go from 70 to like 40 mph. When I was trying to merge into traffic, I got partially into the other lane and then it just wouldn't go. I could easily have been hit. One time when I was coasting and it did it, a warning came on, and then a check manual, but it went away too fast. I have taken it to the dealer and a repair shop multiple times and they can't replicate it. It could definitely cause an accident as my car suddenly slows down and it won't accelerate. I have to wait about 10-15 seconds until it reengages. It makes aloud clunking/dropping sound as if I ran over something and one time it sounded like a million pebbles were inside my engine and under my car. No diagnostic numbers are coming up and it's like no one knows what I am talking about. But multiple Fords are having this issue and they are not doing anything about it. I took it in during my warranty and now it's out of warranty and I'm going to have to pay for something that they should have repaired from the get go. This is dangerous.