https://forum-en.gw2archive.eu/forum/support/mac/Latest-update-Crazy-mouse/first#post558313
This is my problem as well. Disconnects started with the first Halloween patch, and have not subsided. Every time I get a disconnect in-game for no reason, if I leave the client open and just log in again, my mouse goes absolutely bonkers. The camera just spins and spins uncontrollably when I try to pan. Closing the client entirely and re-opening seems to fix the problem. At least until I disconnect again…