The game keeps getting stuck on playing

So this happened the first time straight after the new update while my sims were in the middle of their wedding. I had put it on 3x speed and it got stuck like that. I managed to press the pause button with my mouse and the pause button turned red, but the sims kept moving, not doing any actions, but breathing and looking around. I thought it had gone away but it's just happened again. I've gone through all of my mods and cc and it's not to do with any of that. How do I fix this?