my car has done that to me a few times i pull up it stops then when i go to pull off it does not restart and i have not opened the dor or any thing as it turns its self off if you open drivers door.

it will not work if it is too cold outside or if you have to many things drawing power switched on or if your battery is needing a charge there are other things but i can not remember then. please let me know what the garage says as i also need to have mine looked at i never thought of it as a fault till i seen your post i just presumed that i had done something while it was stoped so that it did not restart.