Door locks - failing one at a time

Hi all,

I have a 2014 Prius C (Two). And in the last 9 months it seems like all of the door locks are failing one at a time. They stop responding to the key fob and the lock button on the door. They do work if you manually roll them into lock position so nothing seems to be binding anywhere.

9 months ago it was the front passenger door lock. I bought a replacement one and installed it and got that working great. Now it looks like both the driver's door and rear passenger side door locks are failing.

Is it really possible that all of them would be going like this? Or is there some other thing I am not considering?

Any thoughts/wisdom is greatly appreciated.