Just wanted to add that I am having the same issue. I have it over night and while I am working on it. I am working on a premier pro project. I have been trying to export it and just as it gets to 99%, it crashes. I have had the issue doing other things as well, so I do not think it is isolated to Adobe, but it's possible that I had acrobat open or creative cloud was doing something in the background. I do have a second monitor, so I am going to unplug it and see if that solves anything - at least long enough to get this video exported.