Sometimes it's related to speed, directly related to a slowdown/slowcoast, like when rolling up to a stop light or sign, other times, like rolling down my street, it just seems a random knocking/clunking. I don't feel any change in steering. Putting on the brakes or accelerating usually stops it. I do not hear that it is bump related. A bump or rougher part of the road doesn't cause it to make the noise.
After you speed up a bit, you don't hear it, you don't hear it coasting on the highway like for slowing interstate traffic...just low speeds.
Thanks all!