The earliest DPS6 boxes were heavily TSB'd and received multiple software updates and material spec changes in clutch packs and seals. Some got much more than others. I know of two early 2012 Powershift transmission fiesta that got the later seals and clutches plus the late software updates and were good to go. At least part of the root cause of the issue was driver behavior with the brake and throttle pedals. The controller had a difficult time reacting to a driver that was doing tentative inputs on the brake and throttle, having the effect of confusing and un- learning shift strategy.
I have driven several of the early ones that are perfectly fine.