2015 Ford E-150 Engine problems

Unexpected and random loss of power --- have to restart to gain power occurred 7 times on 6/27/17 on a 45 mile round trip errors on screen happened two time on 6/28 on 4 mile round trip happened once in early may which I told the ford service person severe safety issue stopping mid traffic rear end collision I had to stop in the middle of the lane and turn it off put in park then start again to get going again "service advancetrac" "hill assist mode not available" "see manual" wrency symbol

As reported to dealer : customer states when accelerating in low gear and letting off the accelerator it will continue to maintain the rpm until you hit hard on the brakes. My added comments is that 1800 rpm when normal highway speed is over 60 mph. In stop and go traffic the driver must maintain brake with left foot and gas with right foot or you will rear end the car in front of you. Ps dealer performed test and stated at this time compared to like units and they do the same thing. I test drove a new truck with same engine and trans. As mine and it did not do the same thing. *Tr