This has been happening for a little while and I'm not entirely sure what it is. I'm hoping people can help me figure out the source. Rarely, I'll be using my PC normally when a gray somewhat transparent rectangle will appear and cover an entire portion of my screen. I'm not sure how to describe the rectangle exactly, it looks a bit like a dither effect. It's gray and made of tiny dots but I can still see the picture underneath. The rectangle only covers maybe 1/5 or 1/6 of my screen in height, but covers the entire width. It really only appears for less than a second, and happens maybe once a day. I've used both the newest drivers and older (16.11.5) drivers from when I don't remember this issue happening. Not too long ago I also had another issue where my PC would often give me a BSOD with the error tread_stuck_in_device_driver but I seem to have fixed that problem, while the gray rectangle happened before the BSOD and remains active. I would like to know if people recognize the problem I mentioned and know what it might be about. Or if they recognize the source of it: monitor cable, monitor itself, GPU, or even Windows. I'd appreciate any help.