It looks like it's on top of a shelf. It might not be getting enough light. Which direction is the window facing?
That said, it's really hard to kill a spider plant...OMFG what are you doing to it?!
The self-regulating thing might not be working, though it should. Try putting the water through the soil instead. Those brown tips might be because of a lack of water.
Do you know if the soil is still good? Does it need repotting? How old is the plant? The soil?