Answer: There are several possible explanations, but in my experience the most common reason is too little light. This plant tolerates low light but actually grows best in bright but still indirect light. In winter especially the light levels are naturally lower and this can slow growth. The next possibility is that the plant is older and has become overgrown and is losing vigor as a result. Division can help re-invigorate it. It also relieves crowding if the plant has grown very large over time. You can also try simply repotting it, either to increase the root space and/or sometimes the potting mix deteriorates over time and needs to be renewed. If you have not fertilized you may also want to do that from spring through fall. Use a water soluble fertilizer at the lower rate on the label and only during the time it is actively growing. Look for something like a general purpose 10-10-10 with minors or use a formulation for foliage container plants. (Do not be tempted to v overfertilize, this plant is sensitive to a buildup of fertilizer salts in the soil.) I hope this helps you trouble shoot.
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