Sorry for the confusion here. Support section posts are taken at a higher priority than bug reports and support threads don’t get auto closed like the bug reports do, that’s why it was moved here.
Support is the place to get help for issues like this, as the game doesn’t freeze at random for everyone, so it’s more likely an issue with your hardware or drivers. And since it’s an important issue for you, support gets a more hands on reply from developers.
As Caboose said, stuttering can be numerous things and most likely could be signs of a hard drive issue (as the game might stutter when its loading large amounts of files). You mention you followed that video and one of the steps was to defrag the hard drive, so hopefully that went well. I’d also just check to see if the computer isn’t running too hot and the graphics drivers are up to date.