If anyone ever hears any metallic rattling, like chains, when going over bumps or dips, it could very well be the metal circlips for the bushings on the UCAs. This is the source of my rattling and others as well have reported this issue. They somehow end up coming loose and rattling around in the metal channel they're in. Solution is to put some silicone on it to stop the rattling, as there are other clips holding the dust/grease boot in place over the bushing, or replace the whole UCA, under warranty if it still is.