I have a sebenza where it seems like a previous owner who was flicking the knife open very hard actually wore a tiny flatter spot on the stop pin collar. (Sebenzas have a metal “donut” that goes around the stop pin).
As the knife is open and closed the stop pin collar rotates and occasionally that flat spot will be in position where the blade locks up against it causing some up and down bladeplay. So it is apparently possible to cause an issue by flicking the Sebenza very very hard. (It is a large 21 so the blade is heavier too causing a flick to impart more force) It actually came back from CRK with this issue so they probably didn’t notice since the stop pin collar has to be rotated just right for it to happen.
I have also heard the idea that since the stop pin is shouldered against the titanium scales; the stop pin can push against the softer Ti when the knife is flicked very hard causing some compression of the ti causing an issue that way. Not sure how true this is given Ti tends to have good memory so might just spring back to shape after being forced against by a flicking blade. This plus the fact Ti is softer might act to cushion the blow? IDK that’s all speculations.
That said I have flicked my other Sebenzas open with no issues. I imagine the previous owner of my faulty one was probably giving very hard wrist action while flicking it open. So if you’re going to flick your CRKs please avoid giving it a hard wrist flick when you do.