It has happened twice to me in my 2017 3.0 AWD. First time I had just entered a highway and the mirrors folded. I was able to push the button and they unfolded.
Second time was this morning after I started my car the mirrors folded back (they weren't folded when I started the car as I leave it unlocked in the garage), I used the button to manually unfold them before backing out of my driveway.
Starting to be a concern for me. If it happens once more I am going to take it in for service.
DeeCee, please post back with an update after they service yours.