Answer: There are several possible causes for this to happen. This plant does well in indirect light so be sure it is not receiving direct sun now that the sun angle is changing with the season.
Change the water about once a week, pouring out the old and adding fresh water.This will limit the buildup of minerals in the water due to evaporation.
If your water is heavily chlorinated or has fluoride, it would be better to use rain water or bottled water for this plant as it is sensitive to chemicals and salts.
Finally, do not let it dry out.
I hope this helps.
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