I've had this truck for a little over two weeks now and cannot figure out this automatic parking brake feature. Every time I put the truck in park it automatically engages the parking brake (obvious enough). However, it only automatically disengages the brake about 20% of the time. I have not been able to figure out any logic to when it auto disengages vs I have to manually press the button to turn it off. If anyone can shed light on this I'd really appreciate it, thanks!