It may be the mouse wheel commands controlled by the Z axis (often Throttle controls on a flight-type joystick) or Point of View hat. Set any throttle control to 0 or to one extreme and see if this resolved the effect. You may need to go into the Advanced options, and look at Button Settings - also Advanced Settings from there. I would suggest you review what input causes the zoom in AutoCad, then see if one of the default options in Joystick-To-Mouse is set there. Check any toggle buttons, or "locked" settings on the joystick itself, as these might be the "constant" input you are seeing. Note on some joysticks the "z" axis is the rotation of joystick itself, or there is a throttle, etc. Because of the different types of joysticks, and the multitude of settings in Joystick-To-Mouse, sometimes errant behavior occurs. But you should be able to remove or disable the setting (or set to something benign).

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