2004 VOLVO C70 Fuelpropulsion System Problems

VEHICLE START THEN DIE OR JUST CRANK AND NO START. AT THE TIME PROBLEM THOUGHT TO BE FUEL PUMP RELAY. IMMOBILIZER WAS CHECKED BUT NOTHING DONE. IMMOBILIZER CONTINUED TO BE A PROBLEM (AFTER WARRANTY EXPIRED); KEYS HAVE BEEN REPLACED/RECODED, IMMOBILIZER CONTROL MODULE FOUND FAULTY AND REPLACED, ANTENNA RING FOUND FAULTY AND REPLACED. THIS IS A SAFETY ISSUE BECAUSE THERE IS NO WARNING PRIOR TO THIS OCCURRING; IT JUST WILL NOT START WHEN THE KEY IS PUT INTO THE IGNITION (COULD BE DAY OR NIGHT - YOU ARE JUST STUCK!) RECENTLY, ON 7-16-2012 THE VEHICLE REPEATED THIS ACTION THREE (3) TIMES ON THE SAME DAY. IN THE LAST TWO (2) MONTHS I HAVE RECORDED NOT LESS THAN TEN (10) INCIDENTS. HAD I CALLED FOR A ROAD ASSIST EACH TIME I WOULD NOT HAVE ANY MORE AVAILABLE CALLS. FOR SOME REASON THE TRANSMITTER AND RECEIVER (TRANSPONDER) ARE NOT IN SYNCH (ANTI-THEFT DEVICE...