I'm having an issue with some type of hum/drone when driving. I recently had the front bearings replaced, and the place that did that said they detected some type of hum/drone when testing the car, but checked things and could not find anything. It's not tire drone, as that changes depending on the road surface. It seems to be getting a bit louder and does change with speed changes. Anyone else have this issue? I'm probably going to take it to the local dealer, but want to find out if this is common or not. Reading a review of the newest LRs, it says they are "library quiet". Clearly not for mine! Thanks.