One year I got lazy, and instead of individually labeling the tubers, I put multiples in baggies, after wrapping them individually. I did have a lot of those rot. So…..maybe what ever container you stored them in is to tight of a seal? I layer mine up with raffia type packing material, and store them in a big plastic bin that doesn't have a sealed lid, then store them on the floor of my concrete slab studio that I usually keep about 55 in the winter, so the floor is closer to 45 degrees.
