I've had several of them fail in the last year (probably 10 or so). Usually it's the older gray modules but I've had the problem with a couple of the black ones also. Sometimes I've been able to replace the module and get it working, sometimes, if there is room, I'll skip the station that isn't working in the controller by moving the wire to one that is.
This is the reason I've switched to installing the ESP-4M when customers need a new controller. Other than lightning damage, they've been bulletproof for me.