Four years ago we had a high priced Mannington Gold vinyl floor installed over a sub-base of plywood. We are on pier and beam and it seems in the last 6 months within one of the corners, the vinyl has pulled away from the shoe molding up the three fourths to one inch away. We have checked under the house and no water leaks or moisture. Should I pull about five feet of it up and try to re-glue the border or do I have a deeper problem? Someone help!!