I have a Sorento 2008 (EX) with automatic transmission that never went off-road. At 6.000 kilometers noticed that the car made a cracking noise while going forward from full stop and while going backwards with the front wheels turned all the way. I took the car to the authorised service and after a week they told me that the problem was with the transfer case. They replaced the whole trasfer case. The car stopped making the noise. 2.000 kilometers after the replacement of the transfer case, the same noise came back again.I went to the same authorised service and asked the chief techician to look over the problem seriously.Ten days later he told me that the problem was again with the transfer case and that they were going to replace it again.Unfortunately when he send the order in for the transfer case, the company told him that we are not going to replace the transfer case again without opening it up and see what was the problem.And so he did.In the transfer case there are some discs that were totally worn off.I don't know how can this be when all the time that I was driving it was on AUTO 4WD. (My car has a button for 2 or AUTO).Two weekns have gone by since then and I am still waiting to get back my car. The technician told me that he was going to replace the discs with more reinforced ones.As far as I know these discs can not be worn out in a car with 12.000 kilometeres only.How come they have reinforced discs but those in the transfer case are not reinforced? I don't think that the problem is in the discs.Can any of you faced this problem?