Question Keeps shutting off automatically

[22Tazzy]

Before I start, yes all power and sleep settings are set to never. I left my computer on all night one night on a roblox game with an auto hot key and nothing happened. The next day it was fine all day, but recently it's started to automatically turn off. Every time I check in on it, after about an hour or so, it takes me back to the password screen and when I type it in it's like my computer was just off and I turned it on (all the pop ups show up like twitch and steam).

 

[Lutfij]

When posting a thread of troubleshooting nature, it's customary to include your full system's specs like so:
CPU:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:

How old is your PSU? You may want to keep an eye on it and see if the system reboots while you're in BIOS or when you're booting to GUI. If that happens, then the culprit can(possibly) be your PSU.