Automatic running boards malfunction. Sometimes they work, sometimes they don't. Sometimes they come out late and take your feet out from under you or smack you in the shins.
Some functions temporarily stop working, such as display of the radio or air conditioner, but usually return if you turn the car off and on.
Power steering has not worked 3 times now. Corrects itself if you turn the engine off and on.
Electric issues in general. Car ACTS as if there is a short or fault or something, as things will mysteriously not work correctly, and then will work again, such as the air conditioner and radio above. Other items have been the door locks, power lift-gate, etc.
Love the car outside of the problems. These problems are not unique to me, as they have been reported by others. The running board problem even had a fix sent out by Ford, but it didn't fix the problem. They have purchased back at least one vehicle that I am aware of due to this. They say they can't recreate so they can't fix it. If I can catch on VIDEO, well that is supposedly a different matter. Been in the shop over 20 days now. This is a low mileage 2 year old car that I LOVE other than these problems. Very comfortable, rides wonderfully, and the functionality is great as long as it works. I am now concerned about my safety driving this car, but the trade-in is so pathetic, it is not fiscally sound to just give up and trade it in. This is our 5th Navigator, and probably our last. They added too many bells and whistles that they cannot control the function of properly and consistently.