This is a known issue they are working on. Unfortunately, this issue is also related to another issue ... the file that contains the "door lock" status keeps (in laymen's terms) appending itself instead of replacing the old data with new data. This causes the file to grow and grow until it's deleted by the server. The unfortunate thing is that this file also contains the status of the rebuild buildings and wells. So, when it's deleted ... all the buildings also return to rubbled state. So hold off on building anything other than original fences/gates/watch towers/flags until fixed.