Being larvae I agree it isn't likely starvation but I wouldn't rule out starvation if they where adult bees; even if it isn't spring; I've seen dearths with large hives that wasn't brining in nectar and starved; not common but possible. You didn't mention the condition of the comb; pollen, nectar, etc.
That said; are there any indications of disease that you can tell? Odor? Does the larvae appear normal? Is it possible the larvae was chilled during a cold night?
Any images; that might help to see the condition of the comb and what the larvae looks like?