My 7 has its share. I think I hear the seat belt noise you're talking about but only when the car is jarred around on very bad pavement. The when that gets me is a whistling sound from the front right ONLY when I drive in wet weather. The service manager wrote that down on the work order last time I brought the 7 in and the monkeys in the service dept. said it was a missing jacking block. NOT!!!!!! It still happens. They did not even bother hosing the car down as the service manager claimed they would have done if they couldn't locate the noise otherwise. What a bunch of freakin incompetent idiots they all are.