Vauxhall Cresta 3.3 PB trouble hot starting

My cresta pb will start on the button when cold/luke warm and will run and run but if i switch off or stall it, when hot (which i have done) it will not start. I then have to leave until its cooled down and again will start no problem any ideas ???

[@marinimatteo9536]

Same issue ... no clue why !

[@MrJack559]

all sorted at long last runs beautiful in all weathers , see vid on channel

[@stephenjose1472]

check voltage at the coil when cranking

[@Quadlaners]

Stephen Jose I did check this all ok and to be sure I made a direct feed from battery to coil , but still the same

[@edwardkennedy9919]

maybe fuel vaporisation.

[@MrJack559]

I think it was/is still not 100% found the problem but currently having garage sorted once done i can get inside and go right through it

[@pre1990motorcycles]

did you fix it

[@Quadlaners]

pre1990motorcycles not yet I left it for a while, I do other cars to use, but i do plan to get back on it soon, I keep you updated

[@alanthomas9241]

Ballast resistor