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I'm sorry but in 50 nears of carrying Victorinox SAK's, and most of my family carrying SAK's, I've never seen or even heard of anything like this happening. My bull hockey meter is pegged at the far end.
Unless a spring is actually broken, it is impossible for a slip joint action pocket knife to open in the pocket without some kind of outside influence or mod to the knife that buggered up the function.
Never happened to me, but those little ones probably do have lighter springs. I carry a standard size SAK.