Can anyone help?

It started a few days ago, I updated my sims game, and everything was fine, I then updated my mods, as usual. And it was fine. However all of a sudden my laptop after like 10 mins my mac would just shut off?

I was confused and thought maybe it was overheating, so I put it on a flat surface, as before I was using my lap. This helped a little bit, but it wouldnt even really get hot before it would shut off again.

I went through my mods, cleaning it out, tried it again and still the same problem,  it would last a tiny bit longer but would then have the same problem again, eventually it would just freeze occasionally but now it just shuts off with no warning. I did eventually remove my mods folder for the ultimate test, and it is not my mods, it seems to be the sims game itself.

I have been playing this game for years with this computer, and I've played for a few hours at a time in the past, with no problem. Im just wondering If anyone could explain this or is experiencing this too? 

And to add, my computer keeps telling me it needs to update, but then says its up to date? And when my laptop turns back on it seems to loose all it's charge.

It's a Macbook Air, Retina 2020. Mac OS Sequoia 15.5. If that helps at all. 

Please let me know if you all have any solutions, thanks 😊