What's wrong with my kalanchoe?



Hello! I was wondering if anyone could help me figure out what's wrong with my kalanchoe blossfeldiana. I got it last September and it's been doing fine so far. I'm keeping it on a windowsill - Eastern sun. During the fall, winter and spring I was watering it once every 2 weeks, now that it's summer I'm watering it once a week. I water it thoroughly so that the water drains through pot holes.
However, for the past month or so the leaves have been developing dark small spots on the undersides. Some of the leaves are also drying, curling and turning yellow/brown. A few of them have already fallen off. I can't figure out what's wrong with the plant, especially with the dark spots on leaves (pics added). I went to google it but got no definitive answer as there are so many possibilities. Can anyone help me?



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