2010 Sante Fe thumping in rear
 

Hi,
First time on this site and asking a question. A lot of great questions and answers.
I have an issue when my suv's gas tank gets to around half tank. Their is a thumping noise in the rear of the suv. This only happens when you come to a stop. It doesn't happen all the time just every once in a while. I've taken the suv back to the service department and they can't find the problem. Has anyone had this problem?