Well, FINALLY (after 5 or 6 visits to two different dealers) got the shifter replaced, it's been almost a month and no "Shift to Park" issue so far, that's the longest period without the issue since it started last October. I think after the second trip Ford should be required to reimburse you for your time and trouble. Issues shouldn't take 5 or 6 visits to resolve, especially when you tell them it's a known issue and that replacing the shifter seems to be the only resolution.