1998 Eagle Talon Ignition/Starting Problem

Vehicle has recently experienced difficulty starting. Engine would crank but not turn over until 2nd or 3rd try. Replaced battery, crank sensor, fuel pump, fuel filter, spark plugs, and had fuel system completely flushed & cleaned at dealership. Began adding drygas to each fill-up, which seemed to help - since the vehicle has started on the first try for the past 30+ starts.

Today vehicle just shut-off while being driven. Not stalled-out, just went dead completely after 1 being driven 1 mile. Radio & lights went out, lost power assist, etc. Pulled over, put car in park and started engine without a problem. Drove 2 miles home without a problem.

What could have caused this to happen & might it be related to the starting problems recently? Could it be an ignition switch or something else in the electrical system that caused both problems. The only other issue that we've had that may be related to this was that the interior lights went out on me once while driving at night (dashboard, console, everything) but then came back on after a few seconds. This occured around the same time that the starting problems surfaced also.