My PC just started having these random restart problems ever since I had used it in a house with voltage fluctuations in a power supply (big mistake not using AVR for it). Isn't affected by gaming, 'cause the restarts happen even when I just browse the internet or just idle. Even when I started using an AVR or went back to using the PC in a house where it worked perfectly before, I still get these restarts. However, I noticed that when I don't use the pc for a long time (like a week), I'd be able to run it for a long time, like 4 hours or, compared to when I regularly use it; where it could run for an hour at max, and after each restart it runs shorter each time. Could this be a power supply problem or something else? Or maybe some bios voltage settings could just help with this?