Well, the drooping plants in the pics of your sig indicate overwatering-- or just watered. Either way, drooping leaves are a sign of getting too much water.
If they have been drooping for a while now, and now spots are showing up, that means that the plants have been overwatered for some time now, a,d lockouts are starting to surface. That's only of you are consistently overwatering though.
Whatever you're doing, the only thing you can do is let the soil mix get real light. Feather light. If the plants perk up during this waiting period, then you know the problem was overwatering.