That's what I was thinking. I was initially worried that it was something more severe but it doesn't happen all the time. If it is something bad it should destroy itself long before the warranty period is up. I'm not worried.
I'm sure it's the same thing that everybody hears. It doesn't happen under hard acceleration for me. If the turn is on an incline I'll usually hear it. I'm curious if it will eventually wear off as time goes on but it probably won't. I'm not concerned as it's really just a noise.