Our right side sliding door seems to "randomly" open. Never when driving, or in gear. Always when parked. Accompanying this strange behavior is the internal button for the right side sliding door (on the b pillar) often doesn't work... it takes 4 or 5 presses for the door to open or close. Touching the button on the exterior door handle, or using either the internal or external handle all work as expected on the right side sliding door.
There has never been a message on the console about an error.
If I were to guess, there is a problem with the button, or what the button is talking to, and the message "eventually" gets to the door... which makes it seem like door opened on its own, but in reality x minutes earlier one if the kids / kids' friends / wife hit the button.
If the car is not locked, and sitting in the driveway, we've looked out the window to find the door open. Even when sitting in the car after we've loaded (maybe setting the GPS or iPads setup), and the car is still in Park (therefore doors are not auto-locked) its has opened.
We've yet to take our Pacifica in for service, and we're at 6500km... this is #1 on the list, but since we work around it by keeping the doors locked, its not a HUGE issue... yet.