I understand it has been blisteringly hot up there recently and a sunny window in the summer may not be the best place for it. Try putting it outside if you have a place that will provide sun for only part of the day and let it dry in between watering. I have had a Christmas Cactus (that came from Quincy) for 30 years that the previous owner betlieved to be around 75 when she gave it to me. It spends it's summers on my front porch where it gets watered once or twice a week and winters in our family room where it doesn't get much sun at all. It's usually looking pretty unhappy by April when it heads back outside.

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Bev