That was my original issue. I thought it was normal. Then I took a video of the sound like the OP and showed it to the dealer who immediately said it was the actuator. Of course that day at the dealership it wouldn't do it. After I played around with cycling the climate control and opening the door it finally did it. It took about a week or so for the part to arrive for me. I would have done it myself now, but it was covered under the warranty from the original purchase still so I figured why not have them do it. Now I'm hoping the OEM part they used will hold up.OMG! My 2018 has been making that noise since the day I got it in 2019. I thought that was just the way it was supposed to be. The actuator replacement is not beyond my skills, abilities, or tool sets. Ordered the Dorman actuator from Rockauto. Can't wait to get rid of that annoying flapping!