draikonm

I run a dedicated server and I noticed a problem a few months back, I cannot tell if it's related to an update but I haven't changed any server settings in the past year so it wouldn't have been man-made. The problem is animals seem to be stuck in some state, they no longer age past their current age, hens do not lay eggs, hostile creatures do not 'hunt' animals, nothing seems to die by itself. I've checked logs but cannot see anything of note. Has anyone else encountered or heard of this?