Ubuntu keeps randomly shutting down

I have Ubuntu on my laptop and it keeps crashing out of no where. I couldn’t find anything in the syslogs or kern.logs about it at the times when it happened. I don’t know if it could be my battery since I don’t know how to test it. I think it might be because the crash it an instant shutdown, as if it was never powered on.

The laptop does has an NVidia card in it and I tried rolling back the drivers like in another post on here, but that didn’t work.

I kept checking sensors between crashes (it happens multiple times within minutes of each other for a bit) but temps never got above 45C.

Is there another place in /var/log to look or some kind of tool to scan for error in the disk? This problem has been happening for a while and I can’t find anyone having the same problem.

Amy suggestions or more info I can give?