Speaker buzzing and crackling 2010

For the past two days my 2010 Prius has been doing strange things. The front passenger side speaker is buzzing and crackling when the car goes above 20 miles per hour. Occasionally the driver side does the same thing on the freeway. I may not be describing the sound exactly right but its odd. The stereo is not on and nothing is plugged in to auxiliary ports. It becomes a little more pronounced at higher speeds. A few weeks ago there were a few issues with the car not registering that I turned it off. It beeped and said that it should be shut off but the key was not present. I am not sure if the two problems are the related but this speaker thing happens every time I drive now. Thanks for the help!