calamondin orange problem

i have a small CO that is about 15 inches tall. there are blooms yet to open but the leaves are falling off of it like 2 to 3 a day. there are no visible signs of stress, color is good.
what should i try?
chaz
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They like to stay moist- I water mine every three days (it's indoors right now, temps ranging from 60-70 F.), and they also like a lot of sun.
Good luck Erin

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