EWI USB help

My ewi usb seems to have gone mad. It will respond to breath pressure but only at a much higher pressure than normal. It responds to some of the keys on the lower half but nothing on the upper half and not the octave rollers. I tried resetting it both with the button and the software. I've used it with two different cables and two different devices. There is no visible corrosion inside. Does anyone have any ideas what might cause that? Thanks!