My 3 month old, 2015 had a similar failure. While leaving an ATM, loss all power, could only go about 5 miles per hour, but had a wrench warning light on the dash. I turned it off, open the door, and then started it up again. That process resets all the electronics. Drove it normally to the dealer who reloaded the computer's memory and told me it was a known problem. I just yesterday drove a loaner MKX (the suv model) and the exact same thing happened. Very scary and dangerous.