After spirited driving in my S4 if I park up for a short while, like 15 to 30 minutes, the car is a pain to start. When cold (or just driven chilled) it fires with a tiny turn of the key and tarts no problem. The car turns over on the ignition but doesn't seem to fire, I have to crank for 3-5 seconds and give it some throttle to make it fire up. When this happens I gat a Brakes warning flashing on my dash but that stops after a few more seconds and the car drives fine. I have vagscan and it doesn't seem to be logging any faults. Any thoughts? Thanks.