Okay so I realize Malcolm kicks you out randomly, regardless of whether or not you've visited the Black Market that day, and you can't go back until reset.
I've been kicked out within two hours of reset 4 out of the last 7 days. And it's extremely frustrating when I'm just trying to track down one item, which never seems to stock when I am able to get in.
I'm proposing that instead of Malcolm kicking us out for up to a full 24 hours, the black market could reset like the stocks do--once at midnight, once at noon.
It'd be less frustrating for everyone, I think.