I've been having the same noise for more than 2 weeks now.
If I accelerate very hard, there is a sliding object that sounds like it's in the driver's door.... Also, if I brake hard, the same noise can be heard.
I have emptied everything that is in the pocket on the driver's door,but that did not help.... the noise is still there.
I even considered booking the car in, and asking them to disassemble the door and get rid of whatever it is that is sliding in there.... the sound really seems like something is sliding inside the driver's door, but there is no way anything can get in there
.
Maybe I also dropped a coin and it is trapped in the air duct under my seat. I will examine the car carefully today.