This is not an isolated incident. See comment below from Jean Southwell whose C-Max also lost power for no apparent reason.
http://blogs.cars.com/kickingtires/2013/07/recall-alert-2013-ford-c-max-hybrid.html
"The much more serious safety problem with the Ford C-Max is the electrical fault/failure that causes the vehicle to totally stop with no power to get out of the way of traffic. The warning that appears on the display is “Stop Safely Now, Drive to a Safe Location.” There is no power to drive anywhere. When you take the car to a dealerhship for repair, as I did,Ford Corporation says they will not reimburse the dealer for repairs unless they can duplicate the event. After they were unable to do so, the dealer service department told me to take the car and drive it away, while agreeing with me that it would very possibly have the same problem again and potentially cause someone to crash into me in traffic. I declined to take the car. The dealer warned me that Ford may decline to continue funding any effort to repair my car which is clearly under warranty, having less than 700 miles.
Do not purchase a Ford C-Max."
And here are several other similar complaints:
http://www.arfc.org/complaints/2013/ford/c-max_hybrid/electrical_system/problem.aspx
Ford knows there is a problem and there is apparently no fix. Hope your lawyer can help.