The ignition module or crankshaft position sensor may fail causing the engine to die and not restart. Diagnoses will be necessary to determine if the module or crank sensor is causing the no start condition.Google+
Car Problem Reports
Buick Regal Car Won't Start Due to Ignition Coil/Crankshaft Position Sensor Failure
Buick Regal Problem
Engine Affected: 3.1L V6
Visitor, 1992 Buick Regal, 3.1L V6, 190,000 mi
Would stop running randomly, usually would start up again--finally stopped starting. Replaced crank position sensor & running good again.