Why does my Mac switch off automatically and then work fine later?

I’ve had my laptop for a little over a year now. Haven’t really had any issues until the last couple of months. I was traveling with my laptop and once I came back home, it refused to switch on. I left it alone for 2 days, and it started working again miraculously. The same thing happened yesterday. I had left my otherwise normal functioning laptop at home, and came back to a dead laptop that wouldn’t start. I left it overnight and it switched on. Once I was done with my work, I switched it off, and the same issue happened. Now after leaving it alone fo a while, it has switched on again.I’m scared to switch it off in case it goes dead again. What exactly is the issue here? Has anyone else faced this.