So...I'll start the car, put it in drive and the D appears in the display, at some point while driving the D disappears and if I have to stop and start it starts driving in either 2nd or 3, can't tell. the shifter is of no use, and if I shut off the engine and restart it's back to normal.
Happens only a couple of times a week at most so there's no predicting. I've driven a couple of days and it's fine, then it'll do it twice in a day.
Another wrinkle is my engine failed so it's a new short block in there. The issue started after it was done.
It's a 14 Optima EX plus 2.4