Khaki Campbells never layed again after molting

[tjcschwar]

Does anyone have advice on how to get my ducks laying again? They were born in May, started laying in October, stopped when they started molting in January. Now they have fine feathers but NO EGGS! Two others did not molt and dutifully supply me with eggs each day, all though the winter (they had a light at night until 10 PM).

Thanks for any advice or similar experiences.