Disappearing Buildings

Certain of my buildings are just plain disappearing off the map between logins. Not only do the squares not show any item there ( i guessed at first it was just a display visual bug ) but i am able to build a NEW building on the spot.

In asking around in general chat, several other players report missing buildings - up to their mayors house going byebye.

Please fix this!

Yeah I noticed the building foundation occasionally disappeaers when you build something and it consumes your building license but the building is not there and you can't build anything new. But the spot is still open because I managed to make a wheat field on top of it.