[only1]

After i run the car hard and go to park i always leave it for a couple of minutes before i shut down.
As soon as i start the car wether it's a few minutes later or shortly after i have parked it, the idle fluctuates like it wants to stahl and then it goes normal to around 600rpm.
Does anyone have an idea as to what this might be? I never have an issue with the startup, but the idle seems to be an issue in the repeated scenario.
Just wondering if this is a symptom of anything to come. I have just under 12,000km on my car and it is an 09. A friend of mine at bmw says it sounds like the programming, but i have never had an issue until recently.