I bought a 2015 Smart fortwo 451. While driving the other day, the traction light came on and the car ran really rough. Got home, turned motor off and restarted. The car ran great again with no codes set. A few days later I was driving and the motor lost power with no response from the foot feed and would only creep about 10 MPH. Pulled off the road, turned motor off and restarted and all power was restored. Still, no codes set. Any ideas would certainly be appreciated.