Did your cyclamen recently bloom? After a cyclamen blooms, it will go into a dormant state and the plant will look like it is dying. The leaves will turn yellow and drop off. So I hope that is what is happening here, that it's not dead, just dormant (sleeping). Once the leaves die, you should stop watering the plant and place it in a cool, somewhat dark place and let it sit for a few months.
For more information on the care of cyclamen, please visit the following link: