That was going to be my next question, only thing that could cause a mass stoppage.I believe I’ve figured it out. I checked the crops of several hens and they seemed fine. I then looked at the water bucket which had water in it, and realized they hadn’t been drinking enough. I checked the nipples and they seemed clogged. When I gave them a pan of water they were all over it. I think they were dehydrated. My guess is they will start laying in a day or two.
Glad you figured it out.