Hi guys, I'm having a strange problem with my HD400. The thing is it randomly turns up or down any of the FX1, FX2, FX3 knobs of the "Smart FX" controls and the reverb knob too. It can be seen in the screen when it happens. I'm not quite sure what causes it, but I suspect that it has to do with the footswitches. Maybe hitting them a little harder than necessary causes this failure. Does anyone knows if it can be solved or fixed?