CURLING LEAVES: First check to make sure your plant is not being over or underwatered, this is the most likely reason your plant's leaves are curling. The next most likely reason is temperature, make sure your plant is not in a drafty area to prevent its leaves curling from the cold.
YELLOW LEAVES: The most common cause of yellowing leaves among Rhaphidophora plants is improper soil moisture—in particular, overwatering. Only water your Rhaphidophora when the top 75% of the soil in the pot is dry.