Hi! I have a 18 Reserve that’s 14 months old now and suffered both the side mirror clicking and the rear hatch auto opening.
I finally had both side mirror motors replaced and haven’t had the issue since!
it took some time, and a few videos emailed to the dealership, but they were finally able to witness the clicking. For me, over the last year, it started out intermittently, but progressively grew more common.
Theres a tsb for the rear hatch, and the expeditions are apparently experiencing it as well. You should insist the dealer research that and correct the issue.