Automatic Transmission problems of the 2008 Ford F-350

I have a 2008 350 super duty Ford truck. I have about 35,000 miles on the truck and in those miles I have had about a dozen incidents where the trucks automatic transmission did not start from a dead stop in 1st. Gear. In stead it must have started in 3rd. Or 4th gear resulting in what would be a very underpowered start. I would press the accelerator to the floor which would result in the transmission down shifting and the wheels spinning even when pulling a 5th wheel trailer. Twice, while empty, I nearly had an accident when I needed a rapid response to enter traffic. The last time this happened was 8/25/2010. When I have taken this complaint to a Ford dealership, they say they can not find any codes, however the last time the dealer did a computer update on the truck and that was about 10 months ago and I thought the problem was solved. I met another person with the same power train as mine who had the same problem, finally his transmission went out and had to be replaced. I would like to have you investigate this issue, it may save a life.