Laptop Shut Down Unexpectedly

Cam - Apr 7, 2016 at 05:17 PM

I booted my laptop (Lenovo ThinkPad T430) into Safe Mode to run antivirus software. I ran my antivirus and Malwarebytes, both found nothing, so I closed my laptop without shutting it down in Safe Mode (I was half asleep and didn't feel like waiting for it to shut down). Hours later, I returned to find it wasn't turning on. I charged it and it turned on, saying "windows shut down unexpectedly". I got back into Safe Mode, then powered off and when I turned it back on it again it ran normally. The battery was very low so I assumed it shut down because of that. Just why unexpectedly?

What could have caused this? There doesn't seem to be a problem now. I'm not good with laptops..