I've got a beautiful cherry Arenberg Parquet pattern floor in Los Angeles. It's about 15 years old. The house was recently remodeled and the oil based finish sanded off. The floor was refinished with a water based product. The finish was chosen because of it's quick dry and cure time. The immediate results were fine, but it's been about 3 months now and the floor has shrunk tremendously. It was previously so tight that you couldn't slip a piece of paper between the boards. Now it's open throughout and in some areas 3/16" wide. It's also apparently not finished shrinking, as it seems to continue it's process. There are no underground water pipes (in the attic). Any suggestions?