Your Collector Sim's Private Museum

Awww, well I was afraid this was going to happen, and it did. I've been having a glitch where after a while of playing none of the dig sites ever come back. It has been about 2 Sim weeks, and no dig site has respawned anywhere in the world. Not the green side, the desert side, or either of the hidden places. This has happened in all of my games, and I have never been able to finish collections because of it. I seem to get about half way though the rocks and elements, then I can never collect anything more. I have no idea how to fix this, I use no CC or mods, I have done all my updates, and this has happened for me since the game came out and for all of my characters. It also seems like this doesn't happen to anyone else. This is very depressing because my two favorite things about Sims have always been collecting and designing homes. I'm going to go over here and be very sad now.