2000 MAZDA MILLENIA Electrical Systemignition Problems

I PURCHASED A 2000 MILLENIA MILLENIA MODEL THAT ONLY HAS 39,000 MILES ON IT. IN OCTOBER, 2003 MY CAR MIS-FIRED AND THE CHECK ENGINE LIGHT CAME ON. THE DIAGNOSIS WAS THAT THE IGNITION COIL FOR CYLINDER #2 WAS BAD AND NEEDED REPLACING. AT THAT TIME, MAZDA CUSTOMER SERVICE PAID FOR THE PART AND I PAID FOR THE LABOR. A FEW DAYS AGO (SIX MONTHS LATER), AN IDENTICAL SITUATION OCCURRED AND THE DIAGNOSIS WAS THAT THE IGNITION COIL FOR CYLINDER # 6 WAS BAD AND NEEDED REPLACING. THE DEALERSHIP CALLED MAZDA INQUIRING ABOUT RESTITUTION, BUT THIS TIME, THE COMPANY PAID FOR NOTHING. I AM VERY CONCERNED ABOUT TWO THINGS. FIRST, WHAT IS THE DEFECT IN MY VEHICLE TO PRECIPITATE THE FAILURE OF TWO IGNITION COILS IN CLOSE SUCCESSION? IS THIS AN ENGINEERING DEFECT? FURTHER, AM I GOING TO HAVE TO GO THROUGH THIS PROCESS FOR ALL 6 CYLINDERS OF MY CAR...

HAVING PROBLEMS GETTING THE CAR TO START. STARTED W/ INTERMITTENT DELAYED STARTS AND NOW ESCALATED TO NOT STARTING AT ALL FOR 1/2 HOUR AND THEN FINALLY STARTED.