I have two Buff Orpingtons and I am getting 2 eggs a week from them. One of my Wyandottes is molting so she is not laying. The other Wyandotte is laying an egg a day. The Olive Egger is laying an egg a day. None of my other hens are laying. They include two Ameraucanas, one Rhode Island red, and one Easter Eggers.
We do not have a heating lamp in the coop so maybe that is why we are getting so few eggs.
Try a heat lamp or artificial day light in the morning- it might reset them. Buffs are usually great winter layers!