Guys, I have been driving automatics for a long time. In this case, it is not the transmission but the throttle which " after the first 1 inch of travel, stops responding for the next 3 inches of travel [no response at all] and then again.
The cable is taught, no play in the inner cable. I have driven a friend's automatic i20 which was purchased around the same time, same problem.
Other than that, its a lovely little luxurious car. Has everything that you want, more than what you can get in cars this size. Build quality superb, comfort, convenience, leg room, air con, music, you name it and you have it.