Ahhhhh,,,,,, the
DNS.
My favorite topic.
It's a common problem with the early cars.
It was so bad that GM eventually changed the wiring harness.
I suspect it's simply too much resistance that is temperature related somewhere in the circuit between the ignition key and the starter solenoid.
It could be wire related (size or metallurgy) or simply mismatched components, who knows, it just plain happens.
Hot restarts simply do not work until the car cools below a threshold temperature.
You can chase the gremlin or you can bypass him.
I highly recommend that you chase the gremlin first and report back if you find the cure.
When you get tired of chasing the gremlin (as I did with no success) well then it's time to apply the
DNS mod.
DNS = Dreaded No Start
TomC
'Crabs