Hello, actually I don't know this is the correct place here for my issue because I had the same issue on alien PC laptop last year. I'm not sure it will have the same issue on Mac side. Currently I'm running the sims 4 on windows 10,Bootcamp. It was also Windows 10 on alien pc notebook. The symptom is that my game is not clickable after leaving the machine alone for a while. So I have to force quit then have to start again, then it works. I probably guess maybe it could be the windows 10 problem. So recently, I just quit game if I have to be away from my game for a while.
My computer spec is:
i7 7700, 3.60GHz, 16 Gbs Ram, Radeon 560 Pro.