My rear swingout door rattles and squeaks while going down the street over uneven surfaces. The door latch guide shows a shiny wear patch where the plastic latch contacts it. I popped the clip out, wiped down everything clean, and spread lightly some silicone grease on all contact points. This worked for about a week, but now sound has returned. Does this mean the clip is worn and should be replaced, or is there some other cure. Sort of a flimsy design for such a heavy door.