Software problems of the 2015 Volkswagen Golf

2015 Golf started experiencing problems with the engine/transmission after Feb 5, 2016 on three different occasions. Upon starting car the idle is extremely rough and then a warning message appears that starts out with "transmission. . . " goes off quickly but a highlighted exclamation point remains. The message goes off too quickly to capture a picture of it. The exclamation point and rough idle remains until the car is turned off. When the car is turned on again it is fine. The car is currently at a dealer to be repaired as they state: we have to replace the shifter assembly. I have been told I cannot drive it, that the car has to stay in the shop and wait for a part to arrive sometime next week. This problem is separate from the other problems I have experienced: 1). The right front seat heater come on and heats up to extremely uncomfortable degrees-- dealer says they cannot find a problem. 2). The navigation system goes blank-- doesn't work-- dealer can't find the problem 3). A warning and beeping that the front right seat belt needs to be fastened-- and no one is in the seat, just a cell phone. This Golf only has 10,600 miles on it. . . . Did I purchase a lemon? the date below is the last time the problem occurred. It may or may not have anything to do with it but the car did not have this problem until after the transmission software update was done in February.