On my new limited, only the back of the driver seat makes a thumping/cluncking noise when you sit in it in certain positions. Does not do it all the time, but when it does it is very annoying. Only occurs on the back of the seat and is more frequent when you sit in it for a longer period of time. Is any one else experiencing this. I took it to a toyota dealer and they said it was the cracking/rubbing you typically get from any leather seats. I do not have this problem with leather seats in other cars or the other seat in my new limited. Thoughts!!!!