There are alot of possible causes. First, we can help you better if we have more information. Does the engine start back up? If not, does it crank. If it does, how easy is it to restart? Do any lights like the check engine light come on, or does all the lights go out? You can go to a parts store and get your codes checked for free to see if we can get any information from the computer. Have you had any other problems in the past?