The batch I made yesterday is already showing signs of weakness. Two things come to mind. The water I used undoubtedly contained oxygen in solution.
Pat - oxygen saturated water at 20C only contains 9.2 mg/L oxygen. First off, that's not much. Second, you can remove it by adding a pinch of sulfite to the water before dissolving they rest of your ingredients.
For up from the ashes, up from the ashes, grow the roses of success!