I get this, and have recently been beginning think I should maybe get it looked at. Mine locks, so if I clench my fist and then straighten out my fingers on my left hand the little finger will stay curled up until I get my other fingers totally straight or deliberatly put force into that finger to straighten it when it gives. It doesn’t click as such but it overcomes some deffinite resistance.
What was worrying my me a little bit was a month or so ago I had a few times when I woke to find that side of my left hand had gone numb. As if I’d been sat on it, but I hadn’t, I was just lying in bed, though I do sleep on that side.