Power locks in 2008 Ford Focus?

I got a problem with my Focus power locks. Sometimes when I close all doors en the I put the locks with remote control some locks are hard of open again and I have to open manually with risk of broke or damage an internal part.

I went some months ago to change all the actuators so the problem were fixed but some months later the problem returned.

I bought that car in used condition furthermore isn't under warranty.

I wanto to supose if the problem is on remote control or is an electric problem in my car.

Have you ever had and experience like this?

Happens quite a bit on Fords. Did you replace the actuators with genuine Ford? All you have to do to test is use a multimeter to see if the actuator is getting power and ground. If it's not getting both, then the actuator is bad.

The non-Ford units are garbage

Manually unlocking the doors DOES NOT risk damaging parts.
If the remote was the problem, NONE of the doors would unlock. Either the actuators are defective, or the wiring is bad.