Thats dealerships for you, i had to take my vette back three times for them to finally repair my oil sending unit.
I have not had that problem that your post is about, i have had the problem where you hit the open button twice real fast and the passenger locks still stays locked. Could be bad battery to havent changed them in my keypad.
I allso have the problem where if you leave your truck closed for about 10 min it will lock automaticaly, i did that a few weeks ago when the truck was running, thank goodness i had the window down some. Now i make sure the keys are with me whenever i leave the truck.