2011 Ecoboost, only a couple times now in a 2 month span ill be driving and the truck will shudder. Then all the numbers on the screen change to dashes, the speedo drops to zero and it shifts into 3rd and stays there. No service required notification, no engine lights, no codes. It just goes blank and drives in 3rd until you shut it off and start it again. Happened twice so far, with a long time in between incidents. Any ideas?