PS4: turning off and turning on and off by itself

Months ago, when I was playing Horizon Zero Down, sometimes my PS4 (original version) just reboot or turn off by itself. Normally this happen a few minutes after I start to play.

I just insisted and after one or two attempts I could play for hours without any trouble.

Later, I noticed that my PS4 sometimes turned on and off a few seconds later by itself, even during the day. I started to notice that this could happen even if I choose the option to turn off the console completely (the light bar off). Some times it does that three or four times in a role, forcing me to pull the power cord.

It is a strange problem, because since I can play for hours, I dissmissed any heating issue…

The only thing I tried was backing up and reinstall the system from scratch using a pendrive. Didn’t solve the problem.

Now I’m playing The Last Guardian and the problem continue. Before open it, I want to see what people here can say about.