Mines done this three times now, so after the last repair I put two small zipties at the top and bottom of the plate. They are small and black and you don't notice them un less you really look. If it has come loose I would not know it.
I own two Gravitydroppers and this happened to my four year old one. I called Gravitydropper and was told to send it in and they would repair it at no cost to me. They fixed it free of charge, and shipped it back to me the next day after they received it. It's now six months later it's still going strong. They're awesome!