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@Dammit
There are no codes thrown when it shuts down - which I would expect from rich/lean.
Therefore it might be the crank position sensor, which won't record a code if it sees zero revs and tells the ECU that the engine has stopped, and therefore that it should cut fuel/spark.
Although why it would not then start until it cools down is odd, unless it can't read the cranking rpm whilst hot.