I am not sure if someone already posted about this or not, so I am posting it since I didn't see it anywhere.
When the BOT stashes items to the stash it moves everything over (including Town Portal scrolls). So for those that are using town portal scrolls (instead of logging in/out), if the bot doesn't find a Town Portal scroll on his next run it can't go to town. So instead it logs out and back in.
I am sure this feature would be useful for other things and not just Town Portal usage.