Answer: Usually, these plants are stiffly upright. Although somewhat tolerant of lower light levels, when grown in a low light situation they may begin to lean. This would be an indication that they need more light or should be rotated periodically to even out the light exposure. Staking may also help.
Or, if overwatered, there may be a root or crown rot problem causing the plant to become unstable. These really need a well drained soil and should be allowed to dry between waterings. If leaves are becoming loose and falling off, I think this is probably the cause. If you suspect this might be the problem, do not add more plants to the same container as they may become infected as well.
You can make more plants by rooting leaf cuttings. Trim off leaf tips, or trim off a healthy leaf and cut it into sections. (Keep them top end up when you plant them.) Let them air dry for a few days. Use clean containers. Insert leaf pieces into a well draining soil mix (potting mix formulated for container plants with some clean coarse builders sand added would be perfect) just deep enough to keep them upright. Place in a bright location and water lightly, just enough to keep them from shriveling. In time they will send up a new leaf. If you plant variegated leaf tips, be aware the new plants will be plain green.
Good luck with your project!
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