I suspect a watering issue--try sticking your finger down a couple inches into the soil and see how wet it feels. These plants generally like to dry out a bit in between waterings so if you're keeping it pretty wet that could be causing the symptoms you're seeing. Underwatering has similar symptoms, although with a plant like this a lot more people kill it by overwatering than underwatering, so I think too much water is more likely. If that's not it then if you could post a picture here that might help someone come up with some other ideas.
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