Chickens and quail can stop/slow down on laying eggs for a number of reasons. Could be do to stress, bad nutrition, they are molting, they are getting older, cold/heat, or less light due to the change of the seasons. For me its molting and the change of the seasons. Chickens need at lest 12 hours of light but 14 or 16 is best. Quail need at lest 14 hours but 16 is best. Some say this is nature’s way of letting the birds rest. If you want to keep them laying you can bring in artificial lighting. Just a normal light bulb will work. I saw some people use Christmas lights makes their coops/pens look very festive for the holidays.