I totally am on the same page as you about the starting circuit of the HID's goes. It just confuses me that I've had the HID's in for over a year, zero problems and now they're acting up. Thats what I can't figure out. And I mentioned I have Projectors cause I didn't know if that would change things. My headlights, on the projector bulb socket it says " do not use High Intensity Discharge bulbs" but I am anyways haha I don't think it would matter though what kinda bulb is used in a projector.
How old is your battery and what kind of health is it in? Could be your battery is fading so you just don't have the juice you used to....