2000 JAGUAR XK CONVERTIBLE Electrical System Problems

THE DATE BELOW IS APPROXIMATE. ON THREE DIFFERENT OCCASIONS MY JAGUAR XK8 LOST POWER AT FULL SPEED. THE ENGINE FAILED AND I LOST POWER STEERING AND POWER BREAKS. I FIRST REPORTED THIS TO MY JAGUAR SERVICE CENTER IN MAY 2003 AFTER THE SECOND INCIDENT. ALTHOUGH THEY COULD NOT DUPLICATE THE FAILURE, THEY REPLACED THE RELAYS BECAUSE THEY SAID THAT THIS HAD SOLVED THE PROBLEM IN OTHER INSTANCES. IT HAPPENED AGAIN A FEW MONTHS AGO AND I AGAIN BROUGHT IN THE CAR. I WAS TOLD THAT AGAIN THE FAILURE COULD NOT BE DUPLICATED IN THE SHOP BECAUSE ALL CODES WERE ERASED WHEN I TURNED OFF THE CAR. I WAS FURTHER TOLD THAT THERE WAS NOTHING FURTHER THAT THEY COULD DO ABOUT THE PROBLEM UNLESS I KEPT THE CAR RUNNING AFTER THE FAILURE. THIS IS A VERY DANGEROUS FAILURE MODE. ONE FEELS LIKE A SITTING DUCK ON THE ROAD WITH NO CONTROL...