I know little to nothing about car maintenance, and I'm experiencing something odd with my wife's 2013 Hyundai Santa Fe.
When we come home in it and turn the car off and get off, maybe a minute or so afterwards the car makes a loud noise (it sounds like it comes from the rear section of the car).
The noise sounds like someone dropping a large stone against thick metal. Not the "clang" noise you'd normally expect from metal, but a much more muted quick noise.
That description may not be the best, but I'm struggling a bit trying to describe it.