I've always been fascinated as to what may cause a fluorescent lamp to instant start vs. rapid start. I've seen instant start CFL's start with a flicker or in steps like a rapid start on certain occasions, such as when put in base up instead of base down, or just randomly on certain days.
I've also seen linear, magnetic-ballasted fluorescent rapid start & preheat ballast occasionally instant-start a lamp.
All I can guess is that environmental conditions (temperature, humidity) and voltage (slightly high or low line voltage at a particular time, or at what point in the AC cycle the switch is turned on) may effect starting behavior.
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I'm lampin...