I am sorry for this delayed reply to your gardening question. We are transitioning to a new Q&A system and your question was unfortunately lost in the transition. I have discovered it now and hope this reply is not too late to be of help.
It may not be getting enough light. Also if the soil stays too wet for a time or gets too dry those symptoms may occur. Try to water adequately but not overwater. Move it to a brighter area gradually as a sudden move will cause sunburn of the foliage.
Thanks for the question. Please stop in again soon!
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