villagers unlink from beds

villagers are unlinking from beds constantly I have a 40 villager iron farm i’ve been using for years no problems so I know i’m doing everything right there is no beds in the area and they still randomly unlink I have broken all the beds and replaced them several times even doing it 1 by 1 making sure green particles pop up for every bed. this is very frustrating because my iron farm will work for a bit and then I have to break the beds again because a villager unlinks from it