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 is overdoing its job). volvo.com was contacted but so far have not done anything to address this. this is definitely a safety related defect and a pricey one. *tr