We have several Waves in our family. Some handles twist more than others. Age and amount of use do not seem to be factors. It seems random but does not appear to affect functionality. The twist is much less noticeable when the joints for the knife blades are broken in; probably because opening the knife blade requires less force, so less force is available to twist the handles.

Curiously, my Supertool handles do not twist at all even when intentionally forced. But as to the Supertool, you're already a devotee and know and love it, or you never will. <img src="images/graemlins/wink.gif" alt="" />

John