I can't exactly see what's going on in the video, but I'm assuming it's the same problem I've had twice in my 3.5 years of owning my K3.? I notice it when the riving knife catches on the ZCI when raising the blade back up from below the table (since I leave my ZCI inserted 99.9% of the time, I lower the blade below the table to change it).
The fix is to tighten one of the Allen-head bolts that holds that bar, but you can't tighten it completely or else raising and lowering the blade becomes difficult.? I haven't bothered to try to put thread lock on that thing to see if that will prevent the issue from coming back.? The last time this happened I also removed that "guard" that (partly?) blocks access to that bolt.? That guard serves no purpose that I can see.
