I came home to a message from my Volt advisor on the phone indicating that there has been a problem with some of the 2013 Volts mysteriously turning off the electric motor while driving. Apparently the steering and brakes will still work, but you have to safely coast to a stop, turn the car off and then power it up again 2-5 minutes later. She indicated that the solution was a software update and I should take the car in as soon as possible. The update takes about an hour. If you have not had this message yet, check with your dealer.