2012 f 150 , dropped into 1 st gear while doing 75 mph with cruise control on. ford doesn't want to help. ideas. anyone else had this problem

Bad transmission control module? Ford really does not owe you anything on a 7 year old truck.

I'd check on some Ford truck forums, I've seen a few topics there on "sudden downshift" problems, most of the time solution was computer updates and/or sensor issues. None of the ones posted had been mechanical problems.

PS: Google "Ford Recalls 285,000 Vehicles; Sudden First Gear Downshifts Reported", I'd post a direct link but spam filter blocks it. Apparently Ford issued a recall for this issue. Article states: "Ford Motor Company issued three recall notices today, but top billing goes to a sensor problem linked to the sudden downshifting (to first gear!) of certain vehicles."