I was having disconnects and lag, it seemed to happen most when my character was still moving and I opened the skills, character, or battle pass windows. I then noticed (while I was in my graphic setting) that D4 was in 4k (3840 X 2160). My monitor does not support it and I have a decent PC but it’s not god-like. (RTX 3060 TI and Ryzen 7 5700G 16G ram) Anyhow, I was not able to change the 4k resolution it was greyed out under the graphic settings. I checked my display properties (on my PC) and I was at 1080p already. So I switched the display setting to a new resolution, (anything that is not 1080p) Kept the changes, then reset it back to 1080p. (CLOSE D4 BEFORE MAKING THESE CHANGES) Anyhow it worked, and the game is running way smoother for now. May be useless info but most of my answers and fixes come from remote posts like this one. Hope it helps if not sorry…