Fadedxox
Apple produced two MacBook Airs in 2020, one with an Intel chip and one with the ARM M1 chip. Which does yours have? Apple > About This Mac. The Intel machines were never designed for any kind of gaming whereas the ARM Macs can handle gaming much better.
Please try a completely new clean Sims 4 folder, free of all your user data and see if it still happens - [INSTRUCTIONS] How to troubleshoot and test a broken game | EA Forums - 11864548 if it does I would guess that your Mac has hardware issues.
If your Mac has an Intel chip you could try resetting the SMC to try and resolve the battery issue - https://support.apple.com/en-us/102605