I'm having a hard time figuring out what causes this to happen. Sometimes the screen goes blank / black when my son is using his computer. Sometimes it is watching videos in a browser(chrome or playing games in a browser. I think it has also done it when he plays some steam games. When it happens, the computer is still running, as I can ssh into it and start and stop some services, but the display manager (lightdm) hangs and cannot be restarted. I feel like the GPU driver is crashing, which causes the display manager to stop working. If I try to soft reboot it hangs. Anyone have any idea what is happening or things to try. I don't thing there is a power issue nor a load issue as I was able to play ARK on medium setting and it ran fine for 1-2 hours.
ASROCK B450M PRO4
Ballistix Sport LT 8GB Kit (4GBx2) DDR4 2666
ASUS Stryx Radeon R9 285
EVGA 430 80+ WHITE
Linuxmint 19.1 Tessa