Why does my laptop keep shutting off bro

Hello, so one day I was using my laptop and it just shut of on me out of no where. It wasn't hot or anything and ever since then it continues to do it. Its very random and annoying. I could go hours without it shutting off and then boom its off. Then when I turn it on it would recommend me to do the system repair thing. And it still continues. Do I have a virus or is there some solution to this.please help!