I am having the same exact issue, I've been experiencing it since early access. Running a 1080 Ti and I have tried both 388.13 and 388.31. I have pinpointed this issue to DX12, at least on my system. When I switch over to DX11, the first 20 seconds that I play it skips a little bit, and then it is fine after that. Really disappointing because the graphics are so much better with DX12. I also noticed that the first minute or so that I loaded into the campaign (I beat it on DX11 lol) my CPU usage is pegged at like 85-90%. A lot of people are reporting this stuttering/freezing even on console. They need to fix this now.
