Engine Skag Tiger Cub Will Not Start After getting Off Machine

I have a Tiger Cub with the Kohler Pro 25 engine that is making me nuts. I will go out and she starts right up, runs great. I can set the parking brake and get off the machine and she will stop running. Try to re start and it as though the battery is totally dead, the starter will not engage. Battery is good as you can hear the solonoid click if you engage the mower. Let the machine sit over night and she starts right back up. I have tried to shut the mower off before I get off the seat and the same thing happens. When I bought the mower I opted for what I call he Truck Driver Seat which gives me a little better ride. I have had it to the shop twice now and replaced the safety switch between the seat and frame, still have the problem. I can load it up and take it back to the shop but the darn thing starts right up for them, can't fix something that's not broke. Any Ideas?????