I just got my own DA 2013 yesterday, and upon unboxing it, have come into some...strange issues. At first I had what one would call the "invisible wall" issue, whereas my mouse cursor would stop as if it had hit the edge of the screen. At first this was the only issue I saw, but after roughly a half hour of usage I ran into another. The mouse will occasionally fail to respond to my movements, at one point I was literally swiping it back and forth to no avail.
I have reinstalled Synapse several times, used different USB ports, changed LoD settings repeatedly, and also installed new graphics drivers, after seeing mention of them potentially be an issue. Admittedly, I have used it after installing the graphics drivers, and it runs smoothly...except when it occasionally loses responsiveness to my motions, which, sadly is pretty game-breaking if even rare.
I am curious as to whether the mouse is simply having trouble tracking still on my surface (no pad, wood desk) or if it is indeed defective. Any feedback will be greatly appreciated.