1. you can buy a AAA shell here from someone (that way you have a completely separate shell that still has access to the AAA 2. not sure why its randomly closing, mine never does that. 3. depends on whatchu want. I've used lists as well as let Abrosia do its thing. lists are probably safer in that it looks more realistic but they require more work. Lately I've been letting my ABer run without a list but just a lower profits and it seems to be fine. You can use lists to divert abrosia to a shop and try and grab higher profit items but if you aren't looking for huge profits right away i dont find that it matters much. This is something you might want to ask other members about though.
just a thought... try to space out the amount of time you spend autobuying..i aim for 2 hrs on and 2 hrs off repeat two or three times. The scheduler function is pretty awesome in helping with this