Finally figured out a peculiar event, with the help of Kia Cutomer Service..
If you garage the car, walk away from your Soul EV leaving it unlocked, it may not stay unlocked.
If you hit the Unlock button on your Smart Key, accidently (or not), 30-sec. later, all doors will lock.
If you garage the car, walk away from your Soul EV leaving it unlocked, it may not stay unlocked.
If you hit the Unlock button on your Smart Key, accidently (or not), 30-sec. later, all doors will lock.