Use a real incandescent lightbulb not a LED or CF bulb!
It only takes a minuscule leakage current to slowly charge up the LED or CF bulb's reservoir cap, and when the voltage gets high enough for the control chip to come out of UVLO (undervoltage lockout), it will switch on till the charge on the cap is used up. The result is a bulb that 'blinks' on briefly at intervals varying from a fraction of a second to several minutes depending on the leakage and the UVLO mode current consumption of the control chip. I've seen it happen just due to wiring capacitance on stair lighting with mechanical switches top and bottom. You could try adding a snubber network (Class X cap and low value series resistor) across the bulb to shunt the leakage current and keep the reservoir cap under the UVLO threshold.