I am thinking Nikon's QC is not what it was on the newest Z stuff. My 70-200's tripod mount got loose on a shoot this week. I had only used it a few times. Lens was wiggling around, very disconcerting...4 little screws hold it on. Does not seem solid like the F versions were. The plastic plug popped off of the know too :<
On my new grip, the little battery door keeps popping off and it's hard to reattach , seems less well made too, kind of the cheaper feel of the Chinese knock-off versions of previous grips I have seen, I'm worrying this could be the future as Nikon is moving all of it's production offshore.