Bit of an older thread but since my 2018 Explorer Platinum suffered the same issue with the passenger side door IA operation being intermittent. Been to the dealer a couple of times but same old "cannot duplicate problem" was all I got. Finally here about two weeks ago, I got up one morning and it had quit again. Took it back to the dealer and the CS rep was able to see that it didn't work. I took it back yesterday for trouble shooting and service. They were finally able to duplicate the problem; cold. When the car was warmed up the door worked, after sitting outside overnight, it didn't work. They had it for two days but finally found a loose connection under the dash. Get it warm and the pieces swelled enough to make a connection. Get it cold and they'd contract to where there was no connection.
For whatever it's worth, maybe it'll help someone else.