Are they in a cold location? Mine is in the garage and it is now reporting 1% battery all the time but it still works. I had one of their contact sensors attached to my freezer that was doing the same (I replaced it with one that takes AAA batteries).
Also, I do have a community driver if you want to try it, but what you describe sounds like a device issue more than a hub/driver issue. [DRIVER] Zooz Sensors Advanced (ZSE40 / ZSE44)