I can confirm exactly the same issue in our group of 2 people playing the game. We've created a new game when the game released 1.0 version (about a month ago) and we were able to play multiplayer in PC (windows 10) through the xbox app with no issues. Now after patch 1.0.4 whenever some of us hosts the game experiences stutter issues every 30 seconds. The game seem to freeze for about 1-2seconds making it unplayable (it's constant). If you could take a look seems to be affecting only the host of the game and I don't know if it has to do with the persistent layer of the game saving to disk or whatnot. We cannot choose to create a new game because we've already are near completing the main quest and have amassed a lot of progress
