So I just got my rift and have been playing with it a little (mostly holding myself back from vomiting).
One thing that I noticed was that one of my adjustment knobs (specifically the left one) is extremely loose. So loose that there isn't much of a click as I turn it. The other one feels fine.
What this means is that if I bump the front left of the headset, it pulls/pushes that side of the screen in out. And because it's so loose, a slight bump is all that's needed.
Anyone else encountered the same issue? Was hoping someone had a simple fix that I could apply before I pull it apart to inspect the mechanism.