The tractor shop says there is nothing wrong with it. They mowed with it for 1/2hr and it restarted ok. I get it back and it does the same thing it's done for the last year, runs fine no matter how hot it is and for as long as I leave it running but if I turn it off it won't restart until it cools down. No issues all winter, I could snow blow for two hours, turn it off and restart it, no problem. I've made sure the radiator and screens are clean and fluids are checked. I need specific suggestions because this shop has always needed to be told specifically what to do. Thanks.