Sims 4 crashing, particularly in CAS

Spicy_Llamacorn​  Sorry for the late reply.  Try updating the BIOS, which you can find by googling "[exact motherboard model] drivers" and clicking the manufacturer's support site.

If that doesn't help, try booting into BIOS and disabling CPU Turbo Boost, which will be somewhere under Advanced settings.

If that doesn't help either, please look for new errors in the Reliability Monitor.  Hit Windows key-R and enter "perfmon /rel" without quotes, and you'll see a chart of errors and updates with a column for each day.  Today is on the right.

Look for an error that happened at exactly the time of your most recent Sims 4 crash.  If you find one, double-click it to see more details, then copy that info and paste it into a reply here.  If you don't see a new error, check back in an hour or so—the Reliability Monitor doesn't always update right away.

I'd like at least two crash reports from after you disabled CPU Turbo Boost.