Honestly, I'd suggest asking them for a replacement, explain your situation, and offer to let them keep it/inspect it for QA purposes.

I too have had a MiniGrip since '03 without problems. For a long time it was my main EDC; the only reason it isn't now is that I have a kershaw leek spring-assist that I love. But the MiniGrip is still my go-to for any outdoor activity. It's a solid instrument.

Good luck getting it sorted; keep us posted on progress please!