AddWash
I do think that the AddWash door does open more often then the main door.
The main door is limited by drum movement, temperature and water level.
The AddWash door AFAIK isn't limited by water level.
But as Samsungs barely ever get to a water level where the door stays locked, well, yeah...
Instant unlocking is one of the things that makes a washer so much more comfortable. A lot of EU machines sill take 60+ seconds to unlock.
And that whole forgotten item thing is more of a marketing gimmick anyways.
In the 2 months since I moved I never forgot an item. Even back home, if something was forgotten, you'd just wait the few days till the next load.
And if it is a must-have: Just unplugg the machine, wait a few minutes, and the door will open EVERY TIME.
Fun fact: Our Panasonic was a little to liberal about unlocking the door. Just after the drain of a boilwash, you could just open the door, with the laundry still being pretty much boiling hot.
Not verry safe...