The cruise control on my 07 dakota 4x4 only works intermittenty. Some days it works and some days it doesn't. I have had it back to Dodge on three ocassions, but alas it has worked on all of those days.On one occasioi it didn't work when I left home, but functioned when they started it to take it into the shop. Does anyone have a suggestion as to what the problem might be. They have been unable to get it to show any codes when tested.