[Al Skierkiewicz]

This is a possibility when the connector has been around for a while or has been abused. The metal spring under the contact becomes deformed and does not provide the contact force needed to keep the contacts in position. It seems to be more of a problem with the stamped contacts. Please check the red plastic inside where the contact comes through from the back of the connector. If you see obvious depressions left by the contact, then I suggest a replacement.