BSOD - BCcode 9f - driver power state failure

Hello Guys,

My system is a self built system that I've been using for about 3 years now. In the last week i've experienced the same BSOD twice and am trying to figure out what is the root cause.

I haven't really made any changes and haven't really had any issues otherwise.. .so it's a bit of a mystery and seems to be happening out of the blue.

Last night i didn't allow my machine to sleep, and the BSOD didn't occur, so it might have something to do with that. The BSOD has only happened when i'm away from the machine, and i'm guessing it might be related to when it's trying to sleep since i set my sleep timer only about 20 min after idle. So either it's happening when it's trying to sleep or wake is my guess.

Attached are the requested files.

No any help would be greatly appreciated!