When some batteries go bad they won't start the truck after a running charge but will start it after cooling off. I'd get the battery checked.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.