During the first 2 weeks of owning the CX-5 I have not noticed any noise but now when starting the car in the morning and putting it into reverse, I hear and kind of feel a low rumble which last for just a couple of seconds. If I put it in drive and put it in reverse again, there is no noise. I am not in a cold climate. Anyone experiencing the same? I am not talking about the louder engine noise for a moment before it warms up.