Reply to Cross fader curve knob

My cross fader curve knob seems to be stuck on the harshest setting regardless of where the actual knob is positioned. It will flick back to a smooth setting if I press on it but otherwise jumps straight back to the harsh setting (this leads me to believe its got something to do with the connection in the wiring. Has anyone else experienced this?

EDIT: And I just noticed the weirdest thing. When my right channel volume fader is all the way down, then the crossfader will work on whatever setting the x-fader curve setting is at the back of the unit. But when the right volume fader is up, the cross fader will act on the harsh setting regardless of where the knob at the back is....