G3X Pin Issue

Hi, I recently purchased a new G3X and went to the range this past weekend. Gun shots well no issues there. But after shooting over 100 rounds the roll pin started to walk out of the frame. I hammered the pin back in. Today went to the range and and shot another 100 rounds. The pin keeps walking out to the left. I hammered the pin back in place. Have not had that issue with my G2C or G3 . Has anyone experience this issue?