welcome to the board.
there has been 3 or 4ish engine failures on this board. that is not more than any other new car out there. that being said, there is no way one can say: "the santa fe is problematic due to engine or transmission problems". its a great car, with a great warranty. buy it and enjoy it.
there are many threads already active on here about various engine issues, so we dont need another. i am closing this thread since it pretty much services no purpose.