Hi there, @Alisonf,
I am glad you have been enjoying your Comcast services! I have our modem myself and don't notice any noise coming from it. Let me pull up your account and see if we need to do a modem swap. Can you please private message me your full name? Thank you for posting to our forums.
To send a private message, please click my name "ComcastMartin" then select "Send a Message" on the right side.