Sorry I'm horrible with explanations. Well lets see, I have check the air pressure not lug nuts(I will check that), The brakes appear to be fine to my knoweldge I just got it inspected when I got an oil change.Gonna have to explain it a little better for us to help, could be so many things. I assume you checked air pressure, lug nut torque specs, no hung up caliper, etc?
If your under warranty, it is free. If not, about $900.okay.
Is that an expensive fix?