Welcome to Superchip's Forum.
Have you taken the tuning off for a good period of time to see if the truck has a problem on the stock program? Like a few thousand miles? I would recommend to remove the tuning for a few months and see if the problem occurs on the stock program, as painful as that sounds.
Can you get some info from the tuner for me? Plug the tuner into the truck and during the first 10 secs after powering up it will give you a DB or FW number. Get me that and I will look up the revision to see if there is a noted issue.
Email me directly if your having ANY trouble with the forum.
Not able to LOGIN, email me with your Username that you registered with.