I have the same issue, as described in the original post. It happens to any member of a specific team, so it does not seem to be related to computer hardware. They are either using WIN7 or WIN10. Restarting ARCHICAD helps the problem, but it's a big TW project and logging back can take up to 15 minutes, which is an issue, when it happens 1-2 a day.
Zooming seems to reset to a specific view at each scroll. If I select the zoom from the drop down list from the navigation bar at the bottom, it will remember that and will snap to that value at the start of each scroll.
Similarly, it will reset to a preferred location at the start of each pan, regardless of where the pan has started. This makes certain areas of the plan inaccessible.
So only restart will help, but we want to avoid that, as it takes so much time for users to log back in.
Any other ideas?