sims 4 crashes and freezes while saving and exciting the game

Hi @crinrict my game has recently started crashing on exit. I am not losing anything because I've always save before going save & exit - I don't know why I do it but I always have. Same with manage worlds, save first then save & go to manage worlds.

Anyway last two nights, I save as always then save & exit and the game crashes. Not tried exiting without saving though not sure I am that trusting. 

It could be something to do with MS updating, or failing to do so in the background - or it could be hardware because I built the PC a while back and it's getting a bit tired. Any advice gratefully accepted, thanks