Intermittent stalling when hot / after re-fuel

[Robert986]

I just had a long track day, alltogether the car ran for approx 200 minutes, basically flat out :-)
After about 2/3 of the day I had to re-fuel, after this the engine sometimes just shut off for 1-2-3 seconds at a time. Totally shut off, nut just hesitated or lost ignition on a separate cyl.

I wonder if this somehow could point to a bad crank shaft position sensor? I have actually had the exact same issue at a previous tack day, also the the car was really hot, I had just re-fueled when it started.
After some cooling down I could drive home without no issues at all.

986S 2003, all ideas are very appreciated!