2000 Buick Regal short out when starting

30 days ago my wife had returned froma 4 hour round trip with no car issues. The next day when the car was used and the left hand blinker clicked on, all the dash board light flashed on and the car cut off. When the blinker was shut off and the car stopped, it would start back up again just fine. As the days progressed the car began to do the same thing when both blinkers were turned on. Within 3 weeks the car began to do the same thing when the emergency brake was released the whole way. Each time the car would start fine and it always functioned fine while driving. The last few days it has taken some 'strategic, repeated' releasing of the emergency brake to get the flashing from the electrical short to stop so the car would continue to run. The car has been looked at by a mechanic from a chain service center and they feel it is in the ignition switch and suggested that I take it to a dealer. The blinkers have not been used as we have used proactive driving and the car will intermittently not start whether the em. Brake is on or not. All other electrical components seem to be operating fine and only the turn signal and emergency brake directly affect whether it will start.