**Product has since been replaced by the company I purchased it from. I ended up with an EC2-A and it works great**
When I lifted the mouse from the mouse pad and placed it back on the pad it sometimes took seconds before the sensor worked again. Sometimes it would jump around on screen.
I tried the mouse on 3 different computers.
I tried adjusting the lift off distance between all 3 settings.
I tried the following mouse pads:
Steel Series QCK Heavy
Razer Goliathus speed
Steel Series QCK+
And all 3 mouse pads exhibited the same problem.
I did not have any issues with my older FK1 (pre-Benq) or my new EC2-A on any of these pads.