ETeeskiTutorials FPS 1.30 Opening and Closing Doors issue with copies and prefabs

i followed the tutorial and learned alot, however in making a prefab of the door im running into issues

when i try and make copies of the door and place them in the scene only doors near the original placed door work, if i move them too far away from the first door they stop working... cant figure it out... does each one need to have a unique button name for the button transform? i was doing them as prefabs.
please help.