MBOX 3 Pro Mic Pre Problem

[jazzdrumr]

Wondering if anyone else has experienced this with the new Mbox.
We recently got a MB Pro from Sweetwater for a remote ADR rig. After getting the stupid Mbox monitor app working within reason. We are have a consistent problem with the mic pre's in the unit. A VERY small change in gain at a consistent point on the pot will result in a very drastic and large jump in gain. Like 12dB or better. Happens on both Pre 1 and 2 at different points in the knobs travel. I'd venture this unit is defective but wanted to see if anyone has had this problem.

Thanks

FYI
MacPro Laptop
OS X 10.6.8
MBox 3 Pro

[DonM]

Just a few quick questions (sorry for the obvious!)

#1 Same on any mic? Dynamic and Condenser?
#2 Same on any cable?

-D