I took mine in on 12/13 for the 3rd time. I explained that the clutch would shudder when starting off, and then after driving about 20 miles highway, or stop and go driving, the clutch would shudder and then slip.
They had the car over the weekend and on Wednesday 12/19 they said my problen had been fixed. The service writer said thay had applied the latest software update and the service tech had driven the car, everything was OK. I explained that software would not repair a slipping clutch, but he said take it and drive it and if it acts up again to return.
The next day I drove to the next town (18 miles away) and upon beginning my return trip, the car began to shudder at take-off. I drove back and went straight to the dealer, and parked it in the service entrance. I entered and advised the service writer that it was shuddering and slipping. He advised the service manager, and told me that the service manager and tech would take it out for a drive to see what was happening.
As they started to take-off from the service entrance, the car shuddered and then the clutch slipped completely not allowing the car to move. They can back in and said they would find a true fix and then gave me a new loaner car.
I returned the followng morning and gave them a copy of the service ticket in this thread that had fixed the problem. I think they have a better understanding of the problem now that they experienced how severe the problem can be.
Thanks for the info.