I have a two year old JD 8245R tractor that shuts down. It goes to an idle and won't go into gear or allow any of the controls to work. It has done it 5 times now over the course of the last two weeks. Deere technician has replaced a couple of parts, and then tried unplugging the radio, but nothing has worked. The tractor has less than 500 hours on it, and I really like the thing when it runs, but am losing confidence in the tractor. Any ideas or suggestions would be appreciated. Maybe someone has had a similar experience.