The investigation into Sunday’s death of “Star Trek” actor Anton Yelchin, 27, in a 2015 Jeep Grand Cherokee rolling accident continues. But signs point to a problem that Fiat Chrysler Automobiles has had for years with its electronic automatic gear shifters — namely that some of its cars have shifters that can leave drivers believing they’ve been put safely into park. Instead, the cars can roll away, causing accidents, injuries and even death.