I go make something to eat and leave the PC running, take the dog out, or go to the bathroom and I come back to a locked up hard frozen PC every time. No input works, not the mouse, not ctrl-alt-del, nothing. I step away for a few minutes, and it freezes hard. As long as there's some kind of active input, it works fine and doesn't freeze. It will run fine for days, as long as I'm right in front of it and actively doing something on it, playing a game, watching a video, browsing the internet, whatever. This happens without fail every time I leave the PC alone for more than 10-15 minutes or so. Windows 10 keeps freezing hard on me, but only if I leave it alone for a few minutes.

Windows 10 64 bit, Radeon HD 7970 Ghz Ed 6gb x2, i7 3770, nothing is overclocked, all power settings are disabled and should never sleep or shut down, I'm using a wired internet connection and all wireless is already disabled, I have a SSD that is set to not power down ever, and all HW monitors show everything is running well within acceptable temps and running smoothly with no spikes or issues. This has been going on for months, I've even reinstalled Windows 10 a couple of times, the the issue still persists. There's a more detailed explanation on page 3 of the thread. It was slipping past the scans and the game in question was running perfectly fine.

Turns out it was a bad/corrupted file in one of my games that was freezing the defrag process.

Ocenaudio locks up when left idle