They where coming out of the factory with bad welds, here is the recall from the keystone website, http://www.keystonerv.com/media/3686484/16-274_-_morryde_ramp_door_-_web.pdf
I also bought a new 369, and if you check Keystones website there is a recall for that door. The welds where having issues and they where replacing the hinges, maybe yours didn't get fixed or they fixed it wrong.