I'm 99% certain that a second year layer, post molt, in January, is just taking a break.
From what I'm reading, the reason you are getting some snippy responses is you are blaming it all on the "blue egg gene". That's just not true. Individual birds of any breed in any line can be poor producers. For me, those are culls. A good breeder can produce SQ birds while maintaining decent production. A few of my birds are exceptional, and all are pretty good layers. Dealing with 5 birds at a time it's harder to see some of the flock dynamics and cull purely for personality, but a decent breeder will do just that. Poor layers are eaten, or sold as meat birds. Same for mean roosters. My suggestion for you, if you really want AMs, is to keep the flock you have until production is too low for you to handle, get rid of them all, then replace them with 5 AM pullets the same age from a good breeder. It doesn't have to be Paul, there are many good breeders, but learn the questions to ask someone before you buy birds from them