I have a 2017 Grand Cherokee that the lift gate sometimes stalls when it lifts or drops. Most of the time it works just fine no matter which button I push. The key fob, or the two buttons within the vehicle. But maybe 30% of the time it moves a portion of the travel and then stops.
This vehicle still has the original batteries. (I just replaced the factory tires a couple weeks ago) Could the accessory battery be getting weak and causing this concern?