Electrical device is likely behind the interference. A mysterious "dead zone" in Oakland Park has rendered dozens of remote-control car locks impotent over the past several weeks. In a five-block area of warehouses and small businesses near Dixie Highway and Floranada Road, nobody can explain why the gadgets fail to work. Motorists have had to get into cars the old-fashioned way -- with a key. "It worked at home, it worked at church, it worked everywhere else but here at work," said Lynne Masters, whose attempts to unlock her car by remote have been stymied in the so-called dead zone....