that high lod "issue" ,yes - it happen to me with most optical-led' based sensors.
but Its really strange, the xai's sensor which is A9500[adns-9500] got the one of the lowest LOD.
again, I think your model is defective.
try to blow the sensor
clean the mouse pad
but, you should rma'ing it, that's really strange..
I may try get a replacement from amazon. They are normally good.
Edited by dmxdex2020 - 1/4/11 at 2:01pm