Help. Car starts briefly then shuts off.



Hey I was wondering if anyone has any idea what's wrong with my car. It's a 2002 VY berlina. It runs perfectly well, and at random times while I'm driving the traction control will turn off. The car continues running as normal, but then when I turn it off, it won't start again. The engines turns over as normal, runs for about 0.5 second, then shuts off. After a day or two, it will start as normal. I've had it in to auto elc/ Holdens and they can't find anything wrong with it, no error codes or anything. Does anyone have a clue what could be happening?