I get a zipping, zipping should from under drivers seat when door is opened. Happens when car is cool. It also has happened after car is shut off for over 20 hrs and no doors opened or unlocked. Happens quite often, contacted ford twice, told me it is the transfer case learning its settings, would offer no other explainaton, no one else I could talk too. Five different dealers would not touch car, said ford said to leave it alone. Checked 15 other 2020 explorer ST’s at various dealers, none made any noises. None would not even do a diagnostic check. Where do I go from here?