Yep, this was ongoing problem that was never truly fixed.
I would try downloading the Fall Creators update manually and update your graphic card drivers to the newest version if you've haven't yet.
Seems far more stable now that I've done the update
Downloading it now, since it says I didn't have the latest Win version installed.
Also, yea I have the latest nvidia driver, and I read lots of complaints about it on forums. Someone suggested to uninstall the driver, and install an older one.
Also, I checked Watch Dogs 2 again, didn't really get stutters, but fps was still between 45-50 on ultra. Sometimes I even had 75. But that's with 0% extra details, just plain ultra settings.