The issue started with the patch 1.0.4 release. We all play on PC using the xbox app and game pass. Every one of my group of friends were able to host the game with no issues prepatch, since the patch all of us experience stutters / micro freezes every few seconds, making the game unplayable. Sometimes the host plays fine for 1-2 minutes, then the stutters begin. Starting a new game we didn't observe any issue, so it's something related to our existing game. We tried copying the save and erasing