Errant snap activity.

Does anyone have the same experience? While measuring, drawing lines, placing circles, moving or copying elements, the system snaps to anywhere by itself. Thus I want to draw a line from A to B, and while this action is been executed the system place a random additional point in between A and B. Sometime doing and undoing the action 3 or 4 times, then it reacts normal. Is there a setting to change? I've replaced the mouse, new or old it's the same. It seems if though there's some A.I. trying to guess my next move but getting it wrong each time. This seriously effecting productivity, that I almost want to do the work rather in AECOSIM which is much more stable and available.