quite a few of my own BM Axis lock models do this, so I'd say not that unusual. A quick fix is to identify what part of the blade locks up to the "Axis" lock bar, close the knife, get a pencil and draw all over the contact point with the pencil. This effectively lubricates the contact point with Graphite Dust (without getting it all over the pivot area and in the handle). This may fix it, it may not. I've just flicked my Axis model BM's enough to get them loosened up enough where it's no longer an issue...