Male stopped locking

I have been pairing since late September I have had many locks but for the past month and a half to 2 months I have not witnessed any locks with all 3 of my pairings. It's like the male is no longer interested. Any ideas on what's going on?

Could be your girl is gravid and is no longer being receptive to the males advances.

I have 3 females and 2 males I'm rotating and they all stopped

You haven't witnessed any ovulations?
Search for signs of building vs gravid females, they might just be done with breeding.
Are they on the hotspot or still wrapping the water bowl on the cool side? Laying inverted? Perfect coils? Have you been feeding, if so, did they stop taking food? A.s.o..

Either way you'll know at some point I guess;) good luck.

Palpate your females and check for follicles. Its now almost spring and thats when our breeding season ends.

This happened to m last year as well. I would like to be the first to say congrats on the gravid females. Eggs should be coming soon. I don't know how common it is but, my pairs stopped locking up shortly before the lay-date.