Found my van half-way down the driveway twice now

Automatic

On an automatic transmission, when you put it in park there is a part called a parking pawl that locks the transmission. Now if the shifter is out of adjustment, when you put it in park, the pawl might not be seating as well as it should, or if the adjustment is good the pawl or the mating gear could be worn. Have you ever heard someone put a car in park before the car comes to a complete stop. That grinding noise it makes before it completely stop is the parking pawl trying to engage the mating gear to lock the transmission. Hope this makes some sense to you.

Thank you! I really like to have an idea of what is wrong before taking my vehicle to the shop so I know if they have a clue when they tell me what is wrong. Hopefully this is covered by my warranty. Now I have to apologize to my son. I accused him of taking my van without permission. :-(

What else would you think. I had 2 sisters and me, guess who was in trouble all the time, and I wasn't guilty.. Good Luck.

Nothing apparent but with all of the snow and put holes may be making it un-noticeable.