Have you heard of "hot soak". Google it and you will see what it is. When you turn your motor off for a few minutes it actually gets hotter and can cause problems with ethanol fuel. I don't remember exactly what it does but ( might evaporate fuel in the carb) but any carb motor running on ethanol fuel can do it. Gets worse in hot weather and only occurs when motor is turned off. It's a long shot but you should read up on it.
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