Troubleshooting from a distance is difficult at best, and often counterproductive.
in general heat soak is going to be fuel lines and carburetors exposed to constant heat. I suggest doing a Google search to become better informed on the issue and then follow up with a gained-wisdom inspection of your fuel system.
A better picture might be gained if we knew more about your shut down situation, to include but not be limited to what happens when trying to restart, how long a period passes before it restarts, etc
Larry