Aart, try to work out the timeline on this. I'm having trouble with that. Apparently in Minnesota they have chickens that stop laying for six months in the middle of the summer? Extreme heat can cause a drop in production but not for six months in Minnesota. That means they start laying...
I'm guessing you are in the Southern Hemisphere, in which case it's as certain as can be the molt. You can get molts for different reasons, but normally it's caused by the days getting shorter. Feathers wear out and need to be replaced. In the fall/winter when food was scarce, chickens...