I have a temporary new surface today I am testing with. Basically, I end up in the same situation. Now, here is some interesting info. When that happens, I simply move the mouse to the other surface and it start acting ok. Then, in the seconds following that, I simply move back the mouse on the initial surface and all is ok. So, it seems when that happens the mouse looses its scan. Moving into a new surface and back to the original resets it. Do you know the reason for that?

The temporary surface I have today is the upcoming new top for the desk. So, before giving the final confirmation, I need to make sure the problem is not related to the surface. Something seems to conflict with the mouse. When it does, I have to move the mouse to another surface and it starts working. This is the case when I use it on the usual surface of my desk. But, today, when testing with a prototype (12"x14"), I experience the same.

The new surface is black all over but with some kind of non smooth effect. So, it is not a piano black or mirror. It is a clean surface and my impression is that the problem is not the surface.