I have that problem. It occurs only when the road surface is really rough. I'll show it to the service manager during my next service. It's not a big problem, if they won't rectify it, I'll just stuck a small piece of rubber at the gap between the safety belt cover and the pillar. It should fix the problem.

thanks vincent for support vincent ( both of us is vincent ... my office stuff lauging when i call u 1st time on phone : hello vincent , this is vincent from kia ... LOL      )  ,will give you a call later for your question
for anyone who interest on K5 , welcome to pm /whatsapp me for the beal deal ever .
not much 2012 on market now, for those who plan to get before CNY , better hurry make you decision . 2013 car will only available on march