I've noticed this a few times, but whenever a bot goes to find the nearest of... they have a range.

However, they sometimes move themselves out of range, and if I move them, their range stays in the same location.

Update - this is particular true with my "medic" bot.  I set a rule to find the nearest bot to recharge, but the perimeter is set to where that bot was, not the location of the medic.

In order to cover each area, I need a bot to lose power at specific points, rather than set my own.