ALIEN GLITCH and white screen

I'm having issues when in my sims game where if my sim gets abducted my game freezes, this also happens when my sim becomes pregnant with an alien and gives birth to an alien. My game will crash when I go into CAS to create or edit an alien. I've repaired the game a few times, cleared my cache, restarted the sims, uninstalled the game and I have taken out my mods and cc to see if thats conflicting but its not. I am also having problems when my sims game goes into window mode and I put it on fullscreen again there's a white screen and its stuck on my laptop so I have to restart my laptop and open the sims 4 up again.