I was wondering where the microphone is located in the car. Whenever I am on a call you can hear a lot of rattling noise and static. I’m wondering if I should take it in to the dealer to be checked out.
My girlfriend's car does the same thing, and it is her sunglasses in the overhead holder. I don't know if some models of the K5 have this as an option or not (mine doesn't) but if so, that could be the culprit.