sounds definitely like ignition issue i have had ignition systems play up in the heat such that the engine will stall and start and drive perfect when it cools down.

Could be ignition coil breaking down or any ignition related components.

Also can be your ignition wiring frayed, loose or corroded.

also check your ignition switch could be shorting out inside but seems unlikely as they seem to burn up into smoke when they go (at least it did for me)