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I'm guessing it's caused by "hot soak" the built up heat and the right amount or short time. The starter and engine are hot from the drive, getting gas doesn't take long enough for things to cool down and if it's the original battery they are known to not be all that great. If you have a voltage meter you can check the voltage drop at the starter when cold then when hot. This is actually pretty typical of most engines. When you shut them off there is no cooling air so the heat builds a bit, then starts to cool down. Solution... a higher amp battery and good cables. I've cars that also suffered the same problem.
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