ShyloI had this same exact problem in Windows 10, disable that Xbox DVR crap. It gets annoyed when you try to mess with your resolution.
Had it disabled since I got my pc, I don't think that was the problem. I have an ASUS VG248QE 144hz monitor but my gfx card only has single link DVI and HDMI 1.2 outputs, so I need to upgrade to get more than 75 hz, and even then I only get 75hz on low res 4:3 resolutions (like 640x480 like i was running). Playing was fine but windows sucks balls at that resolution and I'm getting a new GPU in the next month anyways so I was just testing out last night how viable doing that would be to get a little bit smoother gameplay.