ORIGINAL SCREEN WAS CRACKED-UNIT WOULD NOT WORK - LINCOLN REPLACED UNIT. APPROXIMATELY 3 WEEKS AGO AFTER LAST UPDATE FROM FORD, THE UNIT WAS NOT WORKING PROPERLY-COULDN'T USE NAVIGATION BECAUSE IT WOULDN'T TAKE ADDRESSES AND OTHER MINOR ISSUES -WE CALLED AND FORD TRIED TO RESET IT TWICE - DIDN'T WORK. TOOK CAR IN TO FORD LAND-LAKEWOOD, CO. THEY TESTED AND AGAIN TRIED TO RESET - NO LUCK - FINALLY AFTER HAVING THE CAR ALL DAY, THEY WERE AUTHORIZED TO REPLACE UNIT AGAIN. GOT CAR BACK AND WITHIN THE SAME WEEK, THE UNIT STARTED ACTING UP AGAIN - BLANK SCREEN, DELAYED TIME TO COME UP, ALWAYS SAID "PERFORMING SCHEDULED SYSTEM MAINTENANCE", MOST OF TIME BACK-UP SCREEN WOULD NOT COME UP UNTIL WAY AFTER WE HAD BACKED UP AND LEFT; HAD TROUBLE WITH ADDRESSES; ON 11/2 AFTER OUR LAST STOP, SYSTEM DID NOT COME UP AT ALL. TOOK CAR TO DEALERSHIP 11/4 - HAVE HAD IT ALL DAY TESTING IT-THEY DON'T KNOW WHAT IS WRONG WITH IT-NO CALL, NO NOTHING, LINCOLN FORD NEEDS TO GET THEIR ACT TOGETHER AND GET AN ENTIRELY NEW SYSTEM OR LEARN HOW TO FIX THE OLD ONE. THINKING ABOUT TRADING VEHICLE FOR TOYOTA, LEXUS,BUICK OR CADILLAC. TIRED OF THE PROBLEM. NOT A SAFETY ISSUE PER SE BUT IT IS IRRITATING. NOTE-THIS PROBLEM HAS BEEN IN THE NEWSPAPERS NATIONWIDE. I AM SURPRISED THAT THEY HAVEN'T GOTTEN A BETTER SYSTEM. I KNOW MANY OTHER PEOPLE MUST BE HAVING THE SAME PROBLEM OR, DID WE GET A LEMON. *TR