Answer: Cyclamen thrive indoors under the following conditions: Cool temperatures (50F-60F is ideal), bright light (away from direct sunlight), moist potting soil (but not soggy wet), and occasional misting of leaves. Cyclamen goes into a period of dormancy when flowering stops. At this point stop watering and place the pot on its side in a cool spot. In mid-summer repot the tubers in fresh potting soil and begin watering regularly. New stems, foliage and flowers will appear.
If you've been providing conditions as described above, I suspect that your cyclamen is going through it's natural dormancy phase, especially if it has been healthy up to this point.
If the plant has collapsed totally, it indicates crown rot, a condition brought about by overwatering. Another problem cyclamen has is a result of warm, dry conditions.
Hope this helps you diagnose the problem!
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