I have F350 2008 6.4 my Clean Exhaust Filter display comes on only for about 20 seconds when it does the regeneration. Should the display stay on for the 20 minutes or more during the regeneration. Last weekend coming home with our 5th wheel camper the display showed Cleaning Exhaust Filter then that went out. Then about 2 miles down the road the Reduced Engine Power and the light wrench came on. I pulled of the road turn the truck off then back on and have not had anymore problem. I took it to a ford dealer and they could not find anything. Should I look more in to this?