There are people here with more chickens and more experience with chickens than I have. Perhaps, it is possible for 8 month old chickens to go thru a molt. I just wouldn't have expected it.
My experience has been that they wouldn't molt the year they hatched - they molt in the Fall of the 2nd year.
Once they go into that molt, it takes them awhile to come out of it. One month, may be just about a minimum. Some birds molt really hard, others hardly show any sign that they are molting. There may even be an egg or 2 showing up during this time.
It seems like there may be 2 issues here - molting and decreasing hours of daylight. There may be other nutrition issues - insufficient protein, in particular, for the birds to produce an egg. But, at first blush it looks to me like folks are having problems with decreasing light and/or their older birds coming out of a molt. BTW - regrowing feathers is another good reason for adequate protein in the diet.
Steve