Re: Sims 4 keeps freezing on my Mac - help!
Yes. If it worked with a new clean game then crashed with your old saves then the problem is most likely with one or more saves. @crinrict's site is great for information on saves - http://sims4.crinrict.com/en/2014/09/save-games/
It may be that your save game has corrupted in which case there's not much you can do apart from start again ☹️