idle automatically reboot

Hi guys, I'm having a problem on my first hackintosh configuration (Catalina 10.15.2). The PC automatically restarts if I leave it idle for about 5 minutes. Everything works perfectly, even the sleep mode (If I set sleep for 3 minutes the PC goes to sleep normally and after 5/10 it restarts)...

The installation is great and I fixed every problem so far except this headache. The computer would automatically reboot when it is in idle for some time. I wonder if there is any log to check the events, or anyone has met the similar problem before. Tried google but did not get a quick...