[bedrock]My villagers die for no reason

So i secured my villagers with walls and some of them die is maybe there is too much entity? Or sometimes my villager takes falling damage just a little bit but if they dont regenerate their health that can kill them. Or after raids the villagers cheers and launcher fireworks and take damage i dont know or a witch throw potions at them trought walls idk if you have any idea what can happen to them help me pls i play on Switch