2004 Aveo with around 107k miles. Started randomly stalling after warm up on highway. Normally around
55 mpg, would cut out a couple of times and then engine dies. No codes on scanner.

New timing belt, cam sensor, spark plugs and wires, coil pack, fuel pump relay, gas cap and checked for vacuum leaks.

Found a cracked hose and replaced on MAP sensor (still dies though). Runs great while cold and after about 6 miles and it's good and warm, it'll randomly die on the highway. Pull over and turn everything off for about 2 minutes and it starts up and runs great again. If trying to start without turning off first, it'll just crank. Has to be turned off to reset whatever it is that's happening.

Mechanic thinks it's the fuel pump pressuring up causing the relay to trip.

I see that there's numerous comments about the same issue but, no one came back and stated what the problem was on their car.

Thanks for any help. I'm getting sick of putting money into this work car.