hinge pin troubles

Anyone ever have the hinge pin work its way loose on the bathroom wall that slides into place? We were setting up last weekend and I couldn’t get the wall to slide into place. I finally realized that the pin from the piano hinge had worked its way out about 4 inches thus preventing me from sliding the wall to TM wall. Once I realized the problem I was able to unscrew the hinge/slider unit and tap the hinge pin back into place. My worry going forward is this may happen again. Any suggestions on this?
Bruce
2006 / 2619