"After using it a bit more regularly, I found that this problem went away. "

That sounds right. I have the Widelux, very similar set-up/mechanism. The actor, Jeff Bridges, has a great website for his Widelux which explains this and some remedies. If it's too far gone, it has to be repaired but he moves the mechanism and exercises it a bit which keeps it limber...yeah, I know that's not technical and I'm anthropomorphizing it a bit.