brake lights staying on . long trips van totaly shuts down. on 1994 Mercury Villager

some times the brake tail lights will stay on. dont dare take my van across the state it will be going fine and then just totaly shuts its self right down like you turned the key off.has anyone had these problems? and how do i fix it?i have taken it to many shops and they can't find anything wrong ( passes all tests )

Asked by for the 1994 Mercury Villager
brake light concern could possibly be brake light switch. Engine shutting down while driving could be many things. Does it start right back up or does it have to cool down for period of time? Where have you taken it for these concerns?
it will start back up after 10 min but it don't over heat it will stay at normal temp.i have taken it to 5 different shop and they all couldn't find what was wrong the computer says that everything passed.