So your cursor isn't near the edge of the screen or the WASD or arrow keys being pressed? (though even a brief keypress would move more than a few pixels)
Did you try disabling/enabling edge panning in the Game options?
Are you shutting down all non-essential programs (especially anti-virus, or any automation or hotkey programs) before starting the game?
Please email supportdos@larian.com, with a description of the problem and the report.zip file generated by the
D:OS support tool (for the PC version). The report will contain system and game information, any crash dumps, and your saved games (which don't seem relevant, so you can delete all but one from the zip to reduce file size).