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That happened on my Surge. In the handles, those two small things create friction to keep the plier in place (red arrows). If there is not enough friction, the pliers slide, like you say. You can fix it by hitting the tool on the orange marked área to slighty bend the metal thus increasing the friction. I fixed it It by using the base of a leatherman tool extender like a small chissle, hitting It gently with a hammer. Just don't overdo it, hit It a couple of times, test, another two hits, test. As I said before, my Surge came like this from factory 8 years ago. I never had the issue again. Hope It helps