AX4S sticks in gear

When the accelerator is depressed at all, the transmission shifts fine. When releasing the accelerator, the transmission sticks in gear for a good two to three solid seconds. (This seems to be worst in second.) This feels like releasing the accelerator in a vehicle with a standard transmission without clutching. After the two or three seconds, it finally upshifts.

The Taurus Car Club forum was/is useless. I posted multiple questions there and the only response I got to any of them was a moderator correcting what model transmission I *really* meant to reference. However, I've had good experience here and hope someone can answer this question for me. (Should have just come here in the first place. :D )