I am near Roanoke, VA.
Two 8 frame medium hives, 3 deep with plenty of stores.
One queen ceased laying 3 weeks ago -- no capped brood. But queenright.
The other queen was laying until recently--about 4 frames of capped brood.
It may not be the difference, but the laying queen is in a dark green hive, the non-layer in light tan.