This is our second Escape, bought new in 2017, now with 88,000 miles. For the last 30,000 miles, when cruising in top gear and heading up slight grade, transmission stutters and has occasionally exhibited a fairly violent downshift. Giving the car a little bit of gas evokes a smooth downshift to a lower gear. About to take it into the Ford dealer for a transmission flush and a third change of trans fluid. Any suggestions?