Soil seems like it gets dump pretty easily and keeps it like a sponge. I've bought a soil just like this in the spring, and I've had to keep an eye on the watering. Did anything else change during the last couple of weeks? Temperature swings, rainy weather, heat wave (followed by excessive watering)...? I've had the same happen practically on every pepper I ever tried to overwinter. It was OK for the most of the winter, but then at some point, peppers started loosing the leaves. Usually the reason was overwatering, once, the cause was heavy mite infestation. And I mean heavy! The suckers were everywhere.
