Dear customer, thank you for choosing Justanswer. My name is***** would like to help you I am a master mechanic with over 10 years experience with various car brands.
Please excuse the waiting time.
Due to a high demand there are currently delays in answering the questions.
First of all, we have to find out what exactly the cause is. If there is still warranty on the car, not all work is covered by the warranty.
I rather think that we have a problem here with overaged or worn transmission oil. This causes the control system of the gearbox to not work properly anymore and generates errors like: bad shifting behaviour, rough starting and / or shifting back and forth without reason. The transmission oil as operating fluid is usually not covered by guarantees.
Mechanical or electrical defects, on the other hand, are covered. For this reason, a diagnosis should be made first, then the dealer can tell you whether it is a warranty case and whether your vehicle is still under warranty.